Capture compounds, collections thereof and methods for analyzing the proteome and complex compositions

ABSTRACT

Capture compounds and collections thereof and methods using the compounds for the analysis of biomolecules are provided. In particular, collections, compounds and methods are provided for analyzing complex protein mixtures, such as the proteome. The compounds are multifunctional reagents that provide for the separation and isolation of complex protein mixtures. Each compound has the formula: 
                         
wherein: Z is a trityl derivative; X, the reactivity function, covalently binds to amino acid side chains of proteins; Y, the selectivity function, modulates binding of X to the amino acid side chains in proteins such that X binds to fewer proteins when Y is present than in its absence; and Q permits separation or immobilization of the capture compound. Automated systems for performing the methods also are provided.

RELATED APPLICATIONS

This application is a continuation of and claims priority under 35U.S.C. §120 to allowed U.S. application Ser. No. 10/197,954, filed Jul.16, 2002, now U.S. Pat. No. 7,858,560 to Hubert Köster, Suhaib Siddiqiand Daniel P. Little, entitled “CAPTURE COMPOUNDS, COLLECTIONS THEREOFAND METHODS FOR ANALYZING THE PROTEOME AND COMPLEX COMPOSITIONS,” whichclaims benefit of priority under 35 U.S.C. §119(e) to U.S. provisionalapplication Ser. No. 60/306,019, filed Jul. 16, 2001, to Hubert Köster,entitled “COMPOUNDS AND METHODS FOR ANALYZING THE PROTEOME;” to U.S.provisional application Ser. No. 60/314,123, filed Aug. 21, 2001, toHubert Köster, entitled “COMPOUNDS AND METHODS FOR ANALYZING THEPROTEOME;” and to U.S. provisional application Ser. No. 60/363,433,filed Mar. 11, 2002, to Hubert Köster, Mikhail S. Shchepinov and DanielP. Little, entitled “COMPOUNDS AND METHODS FOR ANALYZING THE PROTEOME.”The subject matter of each of these applications is incorporated byreference in its entirety.

This application is related to International PCT application No.PCT/US02/22821, filed Jul. 16, 2002, to Hubert Köster, Suhaib Siddiqiand Daniel P. Little, entitled “CAPTURE COMPOUNDS, COLLECTIONS THEREOFAND METHODS FOR ANALYZING THE PROTEOME AND COMPLEX COMPOSITIONS,” whichalso claims priority to U.S. Provisional Application Ser. Nos.60/306,019, 60/314,123 and 60/363,433. The subject matter of thisapplication is incorporated by reference in its entirety.

FIELD

Provided herein are compounds and methods using the compounds tospecifically and selectively analyze biomolecules. In particular, thecompounds and methods are useful for analyzing the proteome.

BACKGROUND

Understanding the basis of disease and the development of therapeuticand preventative treatments has evolved over the last century fromempirical observation and experimentation to genome wide mutationscanning. The revolution in genomics has provided researchers with thetools to look for a genomic basis for disease. The Human Genome efforthas generated a raw sequence of the 3 billion base pairs of the humangenome and revealed about 35,000 genes. Genetic variations amongstdifferent individuals and in and in between populations are beingstudied in order to determine the association with the predisposition todisease or the correlation to drug efficacy and/or side effects. Thepromise of personalized medicine based on a panel of genetic markers hastantalized the healthcare community and provides an important goal forthose focused on providing diagnostic and treatment options forhealthcare providers and patients.

With the development of a variety of tools in molecular biology, such asnucleic amplification methods, cloning and expression systems andmethods, disease analysis has been based on a genomics or bottom upapproach. This approach presumes that a genetic change or set of changeswill have a long reaching effect on protein function by affecting mRNAtranscription or protein structure and function.

Technologies have been developed to analyze single nucleotidepolymorphisms (SNPs) in an industrial scale (e.g., MassARRAY® and theMassARRAY® system, Sequenom, Inc., San Diego, Calif.) and in pooledsamples to study the frequency of SNPs in populations of various gender,ethnicity, age and health condition. The ultimate goal of these effortsis to understand the etiology of disease on the molecular level (e.g.,based on genetic variances (pharmacogenomics)), to develop diagnosticassays and effective drugs with few or no side-effects.

Genomics has fallen short of the original expectation that this strategycould be used to stratify a population relative to a defined phenotype,including differences between normal and disease patient population orpopulation. Although single genetic markers have been found to beassociated with or cause or predict a specific disease state, genomicinformation may not be sufficient to stratify individual populations byof the association of an SNP (or SNPs) with a given disease, drugside-effect or other target phenotype. Because of the large number ofpotential targets and regulatory signals that affect proteintranslation, it is not sufficient to establish the differentialexpression profiles of messenger RNA in comparing phenotypes orpopulations, such as healthy and disease states, such as the analysesusing expression DNA chips (e.g., GeneChip® technology, Affymetrix,Inc., Santa Clara, Calif.; LifeArray® technology, Incyte Genomics, Inc.,Palo Alto, Calif.). The metabolic activities in a cell are not performedby mRNA but rather by the translated proteins and subsequentlyposttranslationally modified products, such as the alkylated,glycosylated and phosphorylated products.

The study of proteomics encompasses the study of individual proteins andhow these proteins function within a biochemical pathway. Proteomicsalso includes the study of protein interactions, including how they formthe architecture that constitutes living cells. In many human diseasessuch as cancer, Alzheimer's disease, diabetes as well as host responsesto infectious diseases, the elucidation of the complex interactionsbetween regulatory proteins, which can cause diseases, is a criticalstep to finding effective treatment. Often, SNPs and other nucleic acidmutations occur in genes whose products are such proteins as (1) growthrelated hormones, (2) membrane receptors for growth hormones, (3)components of the trans-membrane signal pathway and (4) DNA bindingproteins that act on transcription and the inactivation of suppressorgenes (e.g. p53) causing the onset of disease.

Complex protein mixtures are analyzed by two-dimensional (2D) gelelectrophoresis and subsequent image processing to identify changes inthe pattern (structural changes) or intensity of various protein spots.Two-dimensional gel electrophoresis is a laborious, error-prone methodwith low reproducibility and cannot be effectively automated. This geltechnology is unable to effectively analyze membrane proteins. Further,the resolution of 2D gels is insufficient to analyze the profile of allproteins present in a mixture.

Available protein chips are limited by their ability to specificallycapture hydrophobic and membrane proteins, which are frequently targetsof drug development. Once bound to the chip, proteins are highlyunstable and their structures often do not reflect the true conformationfound under physiological conditions.

Thus, there is a need to develop technologies for analysis of theproteome that allow scaling up to industrial levels with the features ofan industrial process: high accuracy, reproducibility and flexibility inthat the process is of high-throughput, automatable and cost-effective.There is a need to develop technologies that permit probing andidentification of proteins and other biomolecules in their nativeconformation using automated protocols and systems therefor. Inparticular, there is a need to develop strategies and technologies foridentification and characterization of hydrophobic proteins underphysiological conditions. Therefore, among the objects herein, it is anobject herein to provide such technologies.

SUMMARY

Provided herein are methods, capture compounds (also referred to hereinas capture agents) and collections thereof for analysis of the proteomeon an industrial level in a high throughput format. The methods, capturecompounds and collections permit sorting of complex mixtures ofbiomolecules. In addition, they permit identification of proteinstructures predicative or indicative of specific of phenotypes, such asdisease states, thereby eliminating the need for random SNP analysis,expression profiling and protein analytical methods. The capturecompounds, collections and methods sort complex mixtures by providing avariety of different capture agents. In addition, they can be used toidentify structural “epitopes” that serve as markers for specificdisease states, stratify individual populations relative to specificphenotypes, permit a detailed understanding of the proteins underlyingmolecular function, and provide targets for drug development. Theincreased understanding of target proteins permit the design of higherefficiency therapeutics.

Capture compounds, collections of the compounds and methods that use thecompounds, singly or in collections thereof, to capture, separate andanalyze biomolecules, including, but not limited to, mixtures ofbiomolecules, including biopolymers and macromolecules, such asproteins, individual biomolecules, such as proteins, includingindividual or membrane proteins, are provided. The collections contain aplurality, generally at least two, three, typically at least 10, 50,100, 1000 or more different capture compounds. The compounds andcollections are designed to permit probing of a mixture of biomoleculesby virtue of interaction of the capture compounds in the collection withthe components of the mixture under conditions that preserve theirthree-dimensional configuration. Each member of the collection isdesigned 1) to bind, either covalently or through other chemicalinteraction with high binding affinity (k_(a)) such that the binding isirreversible or stable under conditions of mass spectrometric analysisto fewer than all, typically about 5 to 20 or more componentbiomolecules in a mixture, depending upon complexity and diversity ofthe mixture, under physiological conditions, including hydrophobicconditions, and 2) distinguish among biomolecules based upon topologicalfeatures. In addition, the capture compounds generally include a group,such as a single-stranded oligonucleotide or partially single-strandedoligonucleotide, that permits separation of each set of capturecompounds.

The capture compounds and collections are used in a variety of methods,but are particularly designed for assessing biomolecules, such asbiopolymer components in mixtures from biological samples. Thecollections are used in top-down unbiased methods that assess structuralchanges, including post-translational structural changes and, forexample, are used to compare patterns, particularly post-translationalprotein patterns, in diseased versus healthy cells from primary cellsgenerally from the same individual. The cells that serve as the sourcesof biomolecules can be frozen into a selected metabolic state orsynchronized to permit direct comparison and identification ofphenotype-specific, such as disease-specific biomolecules, generallyproteins.

A capture compound includes at a chemical reactivity group X (alsoreferred to herein as a function or a functionality), which effects thecovalent or high affinity (high k_(a)) binding, and at least one ofthree other groups (also referred to herein as functions orfunctionalities). The other groups are selected from among a selectivityfunction Y that modulates the interaction of a biomolecule with thereactivity function, a sorting function Q for addressing the componentsof the collection, and a solubility function W that alters solubility ofthe capture compound, such as by increasing the solubility of thecapture compound under selected conditions, such as variousphysiological conditions, including hydrophobic conditions of cellmembranes. Hence, for example, if membrane proteins are targeted, thenthe capture compounds in the collection are designed with solubilityfunctions that increase or provide for solubility in such environment.

For example, the reactivity group (reactivity function) includes groupsthat specifically react or interact with functionalities on the surfaceof a protein such as hydroxyl, amine, amide, sulfide and carboxylic acidgroups, or that recognize specific surface areas, such as an antibody, alectin or a receptor-specific ligand, or interact with the active siteof enzymes. Those skilled in the art can select from a library offunctionalities to accomplish this interaction. While this interactioncan be highly reaction-specific, these compounds can react multipletimes within the same protein molecule depending on the number ofsurface-accessible functional groups. Modification of the reactionconditions allows the identification of surface accessible functionalgroups with differing reactivity, thereby permitting identification ofone or more highly reactive sites used to separate an individual proteinfrom a mixture. Available technologies do not separate species in theresulting reaction mixture. The collections and compounds providedherein solve that problem through a second functionality, theselectivity group, which alters binding of the reactivity groups to thebiomolecule.

Selectivity functions include a variety of groups, as well as thegeometric spacing of the second functionality, a single strandedunprotected or suitably protected oligonucleotide or oligonucleotideanalog. The selective functionality can be separate from the compoundand include the solid or semi-solid support. The selective functionalityin this embodiment can be porosity, hydrophobicity, charge and otherchemical properties of the material. For example, selectivity functionsinteract noncovalently with target proteins to alter the specificity orbinding of the reactivity function. Such functions include chemicalgroups and biomolecules that can sterically hinder proteins of specificsize, hydrophilic compounds or proteins (e.g., PEG and trityls),hydrophobic compounds or proteins (e.g., polar, aromatic, lipids,glycolipids, phosphotriester, oligosaccharides), positive or negativelycharged groups, groups or biomolecules which create defined secondary ortertiary structure.

The capture compounds can also include a sorting function for separationor addressing of each capture compound according to its structure. Thesorting function, for example, can be a single-stranded (or partiallysingle-stranded) unprotected or suitably protected oligonucleotide oroligonucleotide analog, typically containing between at least about 5and up to 25, 35, 50, 100 or any desired number of nucleotides (oranalogs thereof) containing a sequence permuted region and optionallyflanking regions. Each such block has a multitude of sequencepermutations with or without flanking conserved regions, which iscapable of hybridizing with a base-complementary single stranded nucleicacid molecule or a nucleic acid analog. The sorting function can also bea label, such as a symbology, including a bar code, particularly amachine-readable bar code, a color coded-label, such as small coloredbead that can be sorted by virtue of its color, a radio-frequency tag orother electronic label or a chemical label. Any functionality thatpermits sorting of each set of capture compounds to permit separateanalysis of bound biomolecules is contemplated.

In certain embodiments, each biomolecule to be captured is derivatizedwith more than one capture compound provided herein, where each taggedcompound provides an additional level of sorting capability. In otherembodiments, each of the plurality of compounds that derivatize a singlebiomolecule is different, allowing for specific and efficient sorting ofthe biomolecule mixture (see, e.g., FIG. 3). The capture compound alsocan be multifunctional containing other functionalities that can be usedto reduce the complexity of biomolecule mixtures.

Some of the capture compounds include at least a reactivity function anda selectivity function. These capture compounds optionally includesorting functionalities, which are one or more additional moieties thatbind either covalently or noncovalently to a specific molecule to permitaddressing of the compounds, such as by separation at discrete loci on asolid support, separation of the compounds on discrete loci. Thesecapture compounds also optionally include one or more solubilityfunctions, which are moieties that influence the solubility of theresulting compound, to attenuate or alter thehydrophobicity/hydrophilicity of the compounds (solubility function).

Others of the capture compounds (or capture agents) include at least twofunctional portions: a reactivity function and a sorting function. Thereactive group that specifically interacts with proteins or otherbiomolecules (reactivity function); and the other is an entity (sortingfunctions) that binds either covalently or noncovalently to a specificmolecule(s). This entity can be a nucleic acid portion or nucleic acidanalog portion that includes a single-stranded region that canspecifically hybridize to a complementary single-strandedoligonucleotide or analog thereof.

The capture compounds are provided as collections, generally ascollections of sets of different compounds that differ in allfunctionalities. For sorting of complex mixtures of biopolymers thecollection includes diverse capture compound members so that, forexample, when they are arrayed, each locus of the array contains 0 to100, generally, 5 to 50 and desirably 1 to 20, typically 5 to 20,different biomolecules at each locus in the array.

In practice in one embodiment, a collection of capture compounds iscontacted with a biomolecule mixture and the bound molecules areassessed using, for example, mass spectrometry, followed by optionalapplication of tagging, such as fluorescence tagging, after arraying toidentify low abundance proteins. In other embodiments, a single capturecompound is contacted with one or plurality of biomolecules, and thebound molecules are assessed.

Also provided herein are methods for the discovery and identification ofproteins, which are selected based on a defined phenotype. The methodsallow proteins to bind to the target molecules under physiologicalconditions while maintaining the correct secondary and tertiaryconformation of the target. The methods can be performed underphysiological and other conditions that permit discovery of biologicallyimportant proteins, including membrane proteins, that are selected basedupon a defined phenotype.

Before, during or after exposure of one or a plurality of capturecompounds to a mixture of biomolecules, including, but not limited to, amixture of proteins, the oligonucleotide portion, or analog thereof, ofthese compounds is allowed to hybridize to a complementary strand ofimmobilized oligonucleotide(s), or analog(s) thereof, to allowseparation, isolation and subsequent analysis of bound biomolecules,such as proteins, by, for example, mass spectrometry, such as matrixassisted laser desorption ionization-time of flight (MALDI-TOF) massspectrometry, colorimetric, fluorescent or chemiluminescent tagging, orto allow for increased resolution by mass spectrometry, includingMALDI-TOF mass spectrometry.

The collections of capture compounds can be used to generate compoundarrays to capture target proteins or groups of related proteins that canmimic biological structures such as nuclear and mitochondrialtransmembrane structures, artificial membranes or intact cell walls.Thus, the compounds and compound arrays provided herein are capable ofmimicking biological entities and biological surfaces, thereby allowingfor capture of biomolecules, including but not limited to proteins,which would otherwise be difficult or impossible to capture, such asthose found in transmembrane regions of a cell.

Samples for analysis include any biomolecules, particularlyprotein-containing samples, such as protein mixtures, including, but notlimited to, natural and synthetic sources. Proteins can be prepared bytranslation from isolated chromosomes, genes, cDNA and genomiclibraries. Proteins can be isolated from cells, and other sources. Incertain embodiments, the capture compounds provided herein are designedto selectively capture different post-translational modifications of thesame protein (i.e., phosphorylation patterns (e.g., oncogenes),glycosylation and other post-translational modifications).

Other methods that employ the collections are also provided. In onemethod, the collections or one or more member capture compounds are usedto distinguish between or among different conformations of a proteinand, for example, can be used for phenotypic identification, such as fordiagnosis. For example, for diseases of protein aggregation, which arediseases involving a conformationally altered protein, such as amyloiddiseases, the collections can distinguish between the disease-involvedform of the protein and the normal protein and thereby diagnose thedisease in a sample.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the hybridization, separation and mass spectral analysis ofa mixture of proteins.

FIG. 2 provides a schematic depiction of one embodiment of the apparatusprovided herein.

FIG. 3 illustrates a protein tagged with four compounds provided herein,thereby allowing for specific sorting of the protein.

FIG. 4 shows the increased and specific hybridization resulting from useof two or more oligonucleotide tags.

FIG. 5 shows tagging of a single protein with two differentoligonucleotides in one reaction.

FIG. 6 is a flow diagram of recombinant protein production.

FIG. 7 illustrates production of an adapted oligonucleotide dT primedcDNA library.

FIG. 8 shows production of an adapted sequence motif specific cDNAlibrary.

FIG. 9 shows production of an adapted gene specific cDNA.

FIG. 10 illustrates purification of amplification products from atemplate library.

FIG. 11 shows an adapted oligonucleotide dT primed cDNA library as auniversal template for the amplification of gene subpopulations.

FIG. 12 illustrates decrease of complexity during PCR amplification.

FIG. 13 shows the attachment of a bifunctional molecule to a solidsurface. Illustrated are oligonucleotides ACGTTTTGCGTTGTAGTCAATCG (SEQID NO:155), CGATTGACTACAACGCAAAACGT (SEQ ID NO:156),CGGCCCCATTTTTGGGCGCTACG (SEQ ID NO:157), and CGTAGCGCCCAAAAATGGGGCCG(SEQ ID NO:158).

FIG. 14 shows analysis of purified proteins from compound screening andantibody production.

FIG. 15 provides synthetic schemes for synthesis of exemplary capturereagents provided herein (see, e.g., Example 4).

FIG. 16 provides exemplary reactivity functions for use in the capturereagents provided herein.

FIG. 17 provides exemplary selectivity functions for use in the capturereagents provided herein.

FIG. 18 depicts exemplary points for regulation of metabolic controlmechanisms for cell synchronization.

FIG. 19 depict cell separation and synchronization methods; FIG. 19 adepicts methods for separation of cells from blood from a single patientto separate them by phenotype; FIG. 19 b shows the results of flowcytometry separation of blood cells without labeling; FIG. 19 c shows anexample in which synchronized cells in culture are sorted according toDNA content as a way to separate cells by phase of the cell cycle.

FIG. 20 shows a schematic of a biomolecule capture assay and resultsusing exemplary capture compounds and proteins.

DETAILED DESCRIPTION A. Definitions

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as is commonly understood by one of skill in theart to which the invention(s) belong. All patents, patent applications,published applications and publications, Genbank sequences, websites andother published materials referred to throughout the entire disclosureherein, unless noted otherwise, are incorporated by reference in theirentirety. In the event that there are a plurality of definitions forterms herein, those in this section prevail. Where reference is made toa URL or other such identifier or address, it is understood that suchidentifiers can change and particular information on the internet cancome and go, but equivalent information can be found by searching theinternet. Reference thereto evidences the availability and publicdissemination of such information.

As used herein, an oligonucleotide means a linear sequence of up toabout 20, about 50, or about 100, nucleotides joined by phosphodiesterbonds. Above this length the term polynucleotide begins to be used.

As used herein, an oligonucleotide analog means a linear sequence of upto about 20, about 50, or about 100, nucleotide analogs, or linearsequence of up to about 20, about 50, or about 100 nucleotides linked bya “backbone” bond other than a phosphodiester bond, for example, aphosphotriester bond, a phosphoramidate bond, a phosphorothioate bond, amethylphosphonate diester bond, a thioester bond, or a peptide bond(peptide nucleic acid).

As used herein, peptide nucleic acid (PNA) refers to nucleic acidanalogs in that the ribose-phosphate backbone is replaced by a backboneheld together by amide bonds.

As used herein, proteome means all the proteins present within a cell.

As used herein, a biomolecule is any compound found in nature, orderivatives thereof. Biomolecules include, but are not limited tooligonucleotides, oligonucleosides, proteins, peptides, amino acids,lipids, steroids, peptide nucleic acids (PNAs), oligosaccharides andmonosaccharides.

As used herein, MALDI-TOF refers to matrix assisted laser desorptionionization-time of flight mass spectrometry.

As used herein, the term “conditioned” or “conditioning,” when used inreference to a protein thereof, means that the polypeptide is modifiedto decrease the laser energy required to volatilize the protein, tominimize the likelihood of fragmentation of the protein, or to increasethe resolution of a mass spectrum of the protein or of the componentamino acids. Resolution of a mass spectrum of a protein can be increasedby conditioning the protein prior to performing mass spectrometry.Conditioning can be performed at any stage prior to mass spectrometryand, in one embodiment, is performed while the protein is immobilized. Aprotein can be conditioned, for example, by treating it with a cationexchange material or an anion exchange material, which can reduce thecharge heterogeneity of the protein, thereby for eliminating peakbroadening due to heterogeneity in the number of cations (or anions)bound to the various proteins in a population. In one embodiment,removal of all cations by ion exchange, except for H⁺ and ammonium ions,is performed. By contacting a polypeptide with an alkylating agent suchas alkyliodide, iodoacetamide, iodoethanol, or 2,3-epoxy-1-propanol, theformation of disulfide bonds, for example, in a proteins can beprevented. Likewise, charged amino acid side chains can be converted touncharged derivatives by employing trialkylsilyl chlorides.

Since the capture compounds contain protein and nucleic acid portions,conditioning suitable for one or both portions is also contemplated.Hence, a prepurification to enrich the biomolecules to be analyzed andthe removal of all cations, such as by ion exchange, except for H+ andammonium, or other conditioning treatment to improve resolution isadvantageous for analysis of the nucleic acid portion as well as theprotein portion.

Conditioning of proteins is generally unnecessary because proteins arerelatively stable under acidic, high energy conditions so that proteinsdo not require conditioning for mass spectrometric analyses. There aremeans of improving resolution, however, in one embodiment for shorterpeptides, such as by incorporating modified amino acids that are morebasic than the corresponding unmodified residues. Such modification ingeneral increases the stability of the polypeptide during massspectrometric analysis. Also, cation exchange chromatography, as well asgeneral washing and purification procedures that remove proteins andother reaction mixture components away from the protein can be used toincrease the resolution of the spectrum resulting from massspectrometric analysis of the protein.

As used herein, “matrix” refers to the material with which the capturecompound biomolecule conjugates are combined for MALDI massspectrometric analysis. Any matrix material, such as solid acids,including 3-hydroxypicolinic acid, liquid matrices, such as glycerol,known to those of skill in the art for nucleic acid and/or proteinanalyses is contemplated. Since the compound biomolecule conjugatescontain nucleic acid and protein a mixture (optimal for nucleic acidsand proteins) of matrix molecules can be used.

As used herein, macromolecule refers to any molecule having a molecularweight from the hundreds up to the millions. Macromolecules include, butare not limited to, peptides, proteins, nucleotides, nucleic acids,carbohydrates, and other such molecules that are generally synthesizedby biological organisms, but can be prepared synthetically or usingrecombinant molecular biology methods.

As used herein, the term “biopolymer” refers to a biological molecule,including macromolecules, composed of two or more monomeric subunits, orderivatives thereof, which are linked by a bond or a macromolecule. Abiopolymer can be, for example, a polynucleotide, a polypeptide, acarbohydrate, or a lipid, or derivatives or combinations thereof, forexample, a nucleic acid molecule containing a peptide nucleic acidportion or a glycoprotein. The methods and collections herein, thoughdescribed with reference to biopolymers, can be adapted for use withother synthetic schemes and assays, such as organic syntheses ofpharmaceuticals, or inorganics and any other reaction or assay performedon a solid support or in a well in nanoliter or smaller volumes.

As used herein, biomolecule includes biopolymers and macromolecules andall molecules that can be isolated from living organisms and viruses,including, but are not limited to, cells, tissues, prions, animals,plants, viruses, bacteria and other organisms.

As used herein, a biological particle refers to a virus, such as a viralvector or viral capsid with or without packaged nucleic acid, phage,including a phage vector or phage capsid, with or without encapsulatednucleic acid, a single cell, including eukaryotic and prokaryotic cellsor fragments thereof, a liposome or micellar agent or other packagingparticle, and other such biological materials. For purposes herein,biological particles include molecules that are not typically consideredmacromolecules because they are not generally synthesized, but arederived from cells and viruses.

As used herein, a drug refers to any compound that is a candidate foruse as a therapeutic or as lead compound for designing a therapeutic orthat is a known pharmaceutical. Such compounds can be small molecules,including small organic molecules, peptides, peptide mimetics, antisensemolecules, antibodies, fragments of antibodies, or recombinantantibodies. Of particular interest are “drugs” that have specificbinding properties so that they can be used as selectivity groups or canbe used as for sorting of the capture compounds, either a sortingfunctionality that binds to a target on a support, or linked to a solidsupport, where the sorting functionality is the drug target.

As used herein, the term “nucleic acid” refers to single-stranded and/ordouble-stranded polynucleotides such as deoxyribonucleic acid (DNA), andribonucleic acid (RNA) as well as analogs or derivatives of either RNAor DNA. Nucleic acid molecules are linear polymers of nucleotides,linked by 3′,5′ phosphodiester linkages. In DNA, deoxyribonucleic acid,the sugar group is deoxyribose and the bases of the nucleotides areadenine, guanine, thymine and cytosine. RNA, ribonucleic acid, hasribose as the sugar and uracil replaces thymine. Also included in theterm “nucleic acid” are analogs of nucleic acids such as peptide nucleicacid (PNA), phosphorothioate DNA, and other such analogs and derivativesor combinations thereof.

As used herein, the term “polynucleotide” refers to an oligomer orpolymer containing at least two linked nucleotides or nucleotidederivatives, including a deoxyribonucleic acid (DNA), a ribonucleic acid(RNA), and a DNA or RNA derivative containing, for example, a nucleotideanalog or a “backbone” bond other than a phosphodiester bond, forexample, a phosphotriester bond, a phosphoramidate bond, amethylphosphonate diester bond, a phosphorothioate bond, a thioesterbond, or a peptide bond (peptide nucleic acid). The term“oligonucleotide” also is used herein essentially synonymously with“polynucleotide,” although those in the art recognize thatoligonucleotides, for example, PCR primers, generally are less thanabout fifty to one hundred nucleotides in length.

Nucleotide analogs contained in a polynucleotide can be, for example,mass modified nucleotides, which allows for mass differentiation ofpolynucleotides; nucleotides containing a detectable label such as afluorescent, radioactive, colorometric, luminescent or chemiluminescentlabel, which allows for detection of a polynucleotide; or nucleotidescontaining a reactive group such as biotin or a thiol group, whichfacilitates immobilization of a polynucleotide to a solid support. Apolynucleotide also can contain one or more backbone bonds that areselectively cleavable, for example, chemically, enzymatically orphotolytically. For example, a polynucleotide can include one or moredeoxyribonucleotides, followed by one or more ribonucleotides, which canbe followed by one or more deoxyribonucleotides, such a sequence beingcleavable at the ribonucleotide sequence by base hydrolysis. Apolynucleotide also can contain one or more bonds that are relativelyresistant to cleavage, for example, a chimeric oligonucleotide primer,which can include nucleotides linked by peptide nucleic acid bonds andat least one nucleotide at the 3′ end, which is linked by aphosphodiester bond, or the like, and is capable of being extended by apolymerase. Peptide nucleic acid sequences can be prepared using wellknown methods (see, for example, Weiler et al. (1997) Nucleic acids Res.25:2792-2799).

A polynucleotide can be a portion of a larger nucleic acid molecule, forexample, a portion of a gene, which can contain a polymorphic region, ora portion of an extragenic region of a chromosome, for example, aportion of a region of nucleotide repeats such as a short tandem repeat(STR) locus, a variable number of tandem repeats (VNTR) locus, amicrosatellite locus or a minisatellite locus. A polynucleotide also canbe single stranded or double stranded, including, for example, a DNA-RNAhybrid, or can be triple stranded or four stranded. Where thepolynucleotide is double stranded DNA, it can be in an A, B, L or Zconfiguration, and a single polynucleotide can contain combinations ofsuch configurations.

As used herein, a “mass modification” with respect to a biomolecule tobe analyzed for mass spectrometry, refers to the inclusion of changes inconstituent atoms or groups that change the molecular weight of theresulting molecule in defined increments detectable by massspectrometric analysis. Mass modifications do not include radiolabels,such as isotope labels or fluorescent groups or other such tags normallyused for detection by means other than mass spectrometry.

As used herein, the term “polypeptide,” means at least two amino acids,or amino acid derivatives, including mass modified amino acids and aminoacid analogs, which are linked by a peptide bond and which can be amodified peptide bond. A polypeptide can be translated from apolynucleotide, which can include at least a portion of a codingsequence, or a portion of a nucleotide sequence that is not naturallytranslated due, for example, to it being located in a reading frameother than a coding frame, or it being an intron sequence, a 3′ or 5′untranslated sequence, or a regulatory sequence such as a promoter. Apolypeptide also can be chemically synthesized and can be modified bychemical or enzymatic methods following translation or chemicalsynthesis. The terms “polypeptide,” “peptide” and “protein” are usedessentially synonymously herein, although the skilled artisan recognizesthat peptides generally contain fewer than about fifty to one hundredamino acid residues, and that proteins often are obtained from a naturalsource and can contain, for example, post-translational modifications. Apolypeptide can be post-translationally modified by, for example,phosphorylation (phosphoproteins), or glycosylation (glycoproteins,proteoglycans), which can be performed in a cell or in a reaction invitro.

As used herein, the term “conjugated” refers to stable attachment,typically by virtue of a chemical interaction, including ionic and/orcovalent attachment. Among the conjugation means are streptavidin- oravidin- to biotin interaction; hydrophobic interaction; magneticinteraction (e.g., using functionalized magnetic beads, such asDynabeads®, which are streptavidin-coated magnetic beads sold by Dynal,Inc. Great Neck, N.Y. and Oslo Norway); polar interactions, such as“wetting” associations between two polar surfaces or betweenoligo/polyethylene glycol; formation of a covalent bond, such as anamide bond, disulfide bond, thioether bond, or via crosslinking agents;and via an acid-labile or photocleavable linker.

As used herein, “sample” refers to a composition containing a materialto be detected. For purposes herein sample refers to anything which cancontain an biomolecule. The sample can be a biological sample, such as abiological fluid or a biological tissue obtained from any organism or acell of or from an organism or a viral particle or portions thereof.Examples of biological fluids include urine, blood, plasma, serum,saliva, semen, stool, sputum, cerebral spinal fluid, tears, mucus,sperm, amniotic fluid or the like. Biological tissues are aggregates ofcells, usually of a particular kind together with their intercellularsubstance that form one of the structural materials of a human, animal,plant, bacterial, fungal or viral structure, including connective,epithelium, muscle and nerve tissues. Examples of biological tissuesalso include organs, tumors, lymph nodes, arteries and individualcell(s).

Thus, samples include biological samples (e.g., any material obtainedfrom a source originating from a living being (e.g., human, animal,plant, bacteria, fungi, protist, virus). The biological sample can be inany form, including solid materials (e.g., tissue, cell pellets andbiopsies, tissues from cadavers) and biological fluids (e.g., urine,blood, saliva, amniotic fluid and mouth wash (containing buccal cells)).In certain embodiments, solid materials are mixed with a fluid. Inembodiments herein, the sample for mass spectrometric analysis includessamples that contain a mixture of matrix used for mass spectrometricanalyses and the capture compound/biomolecule complexes.

As used herein, the term “solid support” means a non-gaseous, non-liquidmaterial having a surface. Thus, a solid support can be a flat surfaceconstructed, for example, of glass, silicon, metal, plastic or acomposite; or can be in the form of a bead such as a silica gel, acontrolled pore glass, a magnetic or cellulose bead; or can be a pin,including an array of pins suitable for combinatorial synthesis oranalysis.

As used herein, a collection refers to combination of two or moremembers, generally 3, 5, 10, 50, 100, 500, 1000 or more members. Inparticular a collection refers to such combination of the capturecompounds as provided herein.

As used herein, an array refers to a collection of elements, such as thecapture compounds, containing three or more members. An addressablearray is one in that the members of the array are identifiable,typically by position on a solid phase support but also by virtue of anidentifier or detectable label. Hence, in general the members of anarray are immobilized to discrete identifiable loci on the surface of asolid phase. A plurality of the compounds are attached to a support,such as an array (i.e., a pattern of two or more) on the surface of asupport, such as a silicon chip or other surface, generally throughbinding of the sorting functionality with a group or compound on thesurface of the support. Addressing can be achieved by labeling eachmember electronically, such as with an radio-frequency (RF) tag, throughthe use of color coded beads or other such identifiable and color codedlabels and through molecular weight. These labels for addressing serveas sorting functions “Q.” Hence, in general the members of the array areimmobilized to discrete identifiable loci on the surface of a solidphase or directly or indirectly linked to or otherwise associated withthe identifiable label, such as affixed to a microsphere or otherparticulate support (herein referred to as beads) and suspended insolution or spread out on a surface.

As used herein, “substrate” refers to an insoluble support onto which asample and/or matrix is deposited. Support can be fabricated fromvirtually any insoluble or solid material. For example, silica gel,glass (e.g., controlled-pore glass (CPG)), nylon, Wang resin, Merrifieldresin, dextran cross-linked with epichlorohydrin (e.g., Sephadex®),agarose (e.g., Sepharose®), cellulose, magnetic beads, Dynabeads®, ametal surface (e.g., steel, gold, silver, aluminum, silicon and copper),a plastic material (e.g., polyethylene, polypropylene, polyamide,polyester, polyvinylidene-difluoride (PVDF)) Exemplary substrateinclude, but are not limited to, beads (e.g., silica gel, controlledpore glass, magnetic, dextran cross-linked with epichlorohydrin (e.g.,Sephadex®), agarose (e.g., Sepharose®), cellulose), capillaries, flatsupports such as glass fiber filters, glass surfaces, metal surfaces(steel, gold, silver, aluminum, copper and silicon), plastic materialsincluding multiwell plates or membranes (e.g., of polyethylene,polypropylene, polyamide, polyvinylidenedifluoride), pins (e.g., arraysof pins suitable for combinatorial synthesis or analysis) or beads inpits of flat surfaces such as wafers (e.g., silicon wafers) with orwithout filter plates. The solid support is in any desired form,including, but not limited to, a bead, capillary, plate, membrane,wafer, comb, pin, a wafer with pits, an array of pits or nanoliter wellsand other geometries and forms known to those of skill in the art.Supports include flat surfaces designed to receive or link samples atdiscrete loci. In one embodiment, flat surfaces include those withhydrophobic regions surrounding hydrophilic loci for receiving,containing or binding a sample.

The supports can be particulate or can be in the form of a continuoussurface, such as a microtiter dish or well, a glass slide, a siliconchip, a nitrocellulose sheet, nylon mesh, or other such materials. Whenparticulate, typically the particles have at least one dimension in the5-10 mm range or smaller. Such particles, referred collectively hereinas “beads”, are often, but not necessarily, spherical. Reference to“bead,” however, does not constrain the geometry of the matrix, whichcan be any shape, including random shapes, needles, fibers, andelongated. “Beads”, particularly microspheres that are sufficientlysmall to be used in the liquid phase, are also contemplated. The “beads”can include additional components, such as magnetic or paramagneticparticles (see, e.g., Dynabeads® (Dynal, Oslo, Norway)) for separationusing magnets, as long as the additional components do not interferewith the methods and analyses herein.

As used herein, “polymorphism” refers to the coexistence of more thanone form of a gene or portion thereof. A portion of a gene of whichthere are at least two different forms, e.g., two different nucleotidesequences, is referred to as a “polymorphic region of a gene”. Apolymorphic region can be a single nucleotide, e.g., a single nucleotidepolymorphism (SNP), the identity of that differs in different alleles. Apolymorphic region also can be several nucleotides in length.

As used herein, “polymorphic gene” refers to a gene having at least onepolymorphic region.

As used herein, “allele”, which is used interchangeably herein with“allelic variant” refers to alternative forms of a gene or portionsthereof. Alleles occupy the same locus or position on homologouschromosomes. When a subject has two identical alleles of a gene, thesubject is said to be homozygous for the gene or allele. When a subjecthas two different alleles of a gene, the subject is said to beheterozygous for the gene. Alleles of a specific gene can differ fromeach other in a single nucleotide, or several nucleotides, and caninclude substitutions, deletions, and insertions of nucleotides. Anallele of a gene also can be a form of a gene containing a mutation.

As used herein, “predominant allele” refers to an allele that isrepresented in the greatest frequency for a given population. The alleleor alleles that are present in lesser frequency are referred to asallelic variants.

As used herein, “associated” refers to coincidence with the developmentor manifestation of a disease, condition or phenotype. Association canbe due to, but is not limited to, genes responsible for housekeepingfunctions whose alteration can provide the foundation for a variety ofdiseases and conditions, those that are part of a pathway that isinvolved in a specific disease, condition or phenotype and those thatindirectly contribute to the manifestation of a disease, condition orphenotype.

As used herein, the term “subject” refers to a living organism, such asa mammal, a plant, a fungi, an invertebrate, a fish, an insect, apathogenic organism, such as a virus or a bacterium, and, includeshumans and other mammals.

As used herein, the term “gene” or “recombinant gene” refers to anucleic acid molecule containing an open reading frame and including atleast one exon and (optionally) an intron sequence. A gene can be eitherRNA or DNA. Genes can include regions preceding and following the codingregion.

As used herein, “intron” refers to a DNA fragment present in a givengene that is spliced out during mRNA maturation.

As used herein, “nucleotide sequence complementary to the nucleotidesequence set forth in SEQ ID NO: x” refers to the nucleotide sequence ofthe complementary strand of a nucleic acid strand having SEQ ID NO: x.The term “complementary strand” is used herein interchangeably with theterm “complement”. The complement of a nucleic acid strand can be thecomplement of a coding strand or the complement of a non-coding strand.When referring to double stranded nucleic acids, the complement of anucleic acid having SEQ ID NO: x refers to the complementary strand ofthe strand having SEQ ID NO: x or to any nucleic acid having thenucleotide sequence of the complementary strand of SEQ ID NO: x. Whenreferring to a single stranded nucleic acid having the nucleotidesequence SEQ ID NO: x, the complement of this nucleic acid is a nucleicacid having a nucleotide sequence that is complementary to that of SEQID NO: x.

As used herein, the term “coding sequence” refers to that portion of agene that encodes a amino acids that constitute a polypeptide orprotein.

As used herein, the term “sense strand” refers to that strand of adouble-stranded nucleic acid molecule that has the sequence of the mRNAthat encodes the amino acid sequence encoded by the double-strandednucleic acid molecule.

As used herein, the term “antisense strand” refers to that strand of adouble-stranded nucleic acid molecule that is the complement of thesequence of the mRNA that encodes the amino acid sequence encoded by thedouble-stranded nucleic acid molecule.

As used herein, the amino acids, which occur in the various amino acidsequences appearing herein, are identified according to theirwell-known, three-letter or one-letter abbreviations. The nucleotides,which occur in the various DNA fragments, are designated with thestandard single-letter designations used routinely in the art (see,Table 1).

As used herein, amino acid residue refers to an amino acid formed uponchemical digestion (hydrolysis) of a polypeptide at its peptidelinkages. The amino acid residues described herein are, in certainembodiments, in the “L” isomeric form. Residues in the “D” isomeric formcan be substituted for any L-amino acid residue, as long as the adesired functional property is retained by the polypeptide. NH₂ refersto the free amino group present at the amino terminus of a polypeptide.COOH refers to the free carboxy group present at the carboxyl terminusof a polypeptide. In keeping with standard polypeptide nomenclaturedescribed in J. Biol. Chem., 243:3552-59 (1969) and adopted at 37 C.F.R.§1.821-1.822, abbreviations for amino acid residues are shown in thefollowing Table:

TABLE 1 Table of Correspondence SYMBOL 1 Letter 3 Letter AMINO ACID YTyr tyrosine G Gly glycine F Phe phenylalanine M Met methionine A Alaalanine S Ser serine I Ile isoleucine L Leu leucine T Thr threonine VVal valine P Pro proline K Lys lysine H His histidine Q Gln glutamine EGlu glutamic acid Z Glx Glu and/or Gln W Trp tryptophan R Arg arginine DAsp aspartic acid N Asn asparagine B Asx Asn and/or Asp C Cys cysteine XXaa Unknown or other

It should be noted that all amino acid residue sequences representedherein by formulae have a left to right orientation in the conventionaldirection of amino-terminus to carboxyl-terminus. In addition, thephrase “amino acid residue” is broadly defined to include the aminoacids listed in the Table of Correspondence and modified and unusualamino acids, such as those referred to in 37 C.F.R. §§1.821-1.822, andincorporated herein by reference. Furthermore, it should be noted that adash at the beginning or end of an amino acid residue sequence indicatesa peptide bond to a further sequence of one or more amino acid residuesor to an amino-terminal group such as NH₂ or to a carboxyl-terminalgroup such as COOH.

In a peptide or protein, suitable conservative substitutions of aminoacids are known to those of skill in this art and can be made generallywithout altering the biological activity of the resulting molecule.Those of skill in this art recognize that, in general, single amino acidsubstitutions in non-essential regions of a polypeptide do notsubstantially alter biological activity (see, e.g., Watson et al.Molecular Biology of the Gene, 4th Edition, 1987, The Benjamin/CummingsPub. co., p. 224).

Such substitutions can be made in accordance with those set forth inTABLE 2 as follows:

TABLE 2 Ala (A) Gly; Ser Arg (R) Lys Asn (N) Gln; His Asp (D) Glu Cys(C) Ser Gln (Q) Asn Glu (E) Asp Gly (G) Ala; Pro His (H) Asn; Gln Ile(I) Leu; Val Leu (L) Ile; Val Lys (K) Arg; Gln Met (M) Leu; Tyr; Ile Phe(F) Met; Leu; Tyr Ser (S) Thr Thr (T) Ser Trp (W) Tyr Tyr (Y) Trp; PheVal (V) Ile; LeuOther substitutions are also permissible and can be determinedempirically or in accord with known conservative substitutions.

As used herein, a DNA or nucleic acid homolog refers to a nucleic acidthat includes a preselected conserved nucleotide sequence, such as asequence encoding a therapeutic polypeptide. By the term “substantiallyhomologous” is meant having at least 80%, at least 90%, at least 95%homology therewith or a less percentage of homology or identity andconserved biological activity or function.

The terms “homology” and “identity” are often used interchangeably. Inthis regard, percent homology or identity can be determined, forexample, by comparing sequence information using a GAP computer program.The GAP program uses the alignment method of Needleman and Wunsch (J.Mol. Biol. 48:443 (1970), as revised by Smith and Waterman (Adv. Appl.Math. 2:482 (1981). Briefly, the GAP program defines similarity as thenumber of aligned symbols (e.g., nucleotides or amino acids) that aresimilar, divided by the total number of symbols in the shorter of thetwo sequences. The default parameters for the GAP program can include:(1) a unary comparison matrix (containing a value of 1 for identitiesand 0 for non-identities) and the weighted comparison matrix of Gribskovand Burgess, Nucl. Acids Res. 14:6745 (1986), as described by Schwartzand Dayhoff, eds., ATLAS OF PROTEIN SEQUENCE AND STRUCTURE, NationalBiomedical Research Foundation, pp. 353-358 (1979); (2) a penalty of 3.0for each gap and an additional 0.10 penalty for each symbol in each gap;and (3) no penalty for end gaps.

Whether any two nucleic acid molecules have nucleotide sequences thatare at least 80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% “identical” can bedetermined using known computer algorithms such as the “FAST A” program,using for example, the default parameters as in Pearson and Lipman,Proc. Natl. Acad. Sci. USA 85:2444 (1988). Alternatively the BLASTfunction of the National Center for Biotechnology Information databasecan be used to determine identity.

In general, sequences are aligned so that the highest order match isobtained. “Identity” per se has an art-recognized meaning and can becalculated using published techniques. (See, e.g.: ComputationalMolecular Biology, Lesk, A. M., ed., Oxford University Press, New York,1988; Biocomputing: Informatics and Genome Projects, Smith, D. W., ed.,Academic Press, New York, 1993; Computer Analysis of Sequence Data, PartI, Griffin, A. M., and Griffin, H. G., eds., Humana Press, New Jersey,1994; Sequence Analysis in Molecular Biology, von Heinje, G., AcademicPress, 1987; and Sequence Analysis Primer, Gribskov, M. and Devereux,J., eds., M Stockton Press, New York, 1991). While there exist a numberof methods to measure identity between two polynucleotide or polypeptidesequences, the term “identity” is well known to skilled artisans(Carillo, H. & Lipton, D., SIAM J Applied Math 48:1073 (1988)). Methodscommonly employed to determine identity or similarity between twosequences include, but are not limited to, those disclosed in Guide toHuge Computers, Martin J. Bishop, ed., Academic Press, San Diego, 1994,and Carillo, H. & Lipton, D., SIAM J Applied Math 48:1073 (1988).Methods to determine identity and similarity are codified in computerprograms. Computer program methods to determine identity and similaritybetween two sequences include, but are not limited to, GCG programpackage (Devereux, J., et al., Nucleic Acids Research 12(I):387 (1984)),BLASTP, BLASTN, FASTA (Atschul, S. F., et al., J Molec Biol 215:403(1990)).

Therefore, as used herein, the term “identity” represents a comparisonbetween a test and a reference polypeptide or polynucleotide. Forexample, a test polypeptide can be defined as any polypeptide that is90% or more identical to a reference polypeptide.

As used herein, the term at least “90% identical to” refers to percentidentities from 90 to 99.99 relative to the reference polypeptides.Identity at a level of 90% or more is indicative of the fact that,assuming for exemplification purposes a test and reference polypeptidelength of 100 amino acids are compared. No more than 10% (e.g., 10 outof 100) amino acids in the test polypeptide differs from that of thereference polypeptides. Similar comparisons can be made between a testand reference polynucleotides. Such differences can be represented aspoint mutations randomly distributed over the entire length of an aminoacid sequence or they can be clustered in one or more locations ofvarying length up to the maximum allowable, e.g., 10/100 amino aciddifference (approximately 90% identity). Differences are defined asnucleic acid or amino acid substitutions, or deletions.

As used herein: stringency of hybridization in determining percentagemismatch is as follows:

1) high stringency: 0.1×SSPE, 0.1% SDS, 65° C.

2) medium stringency: 0.2×SSPE, 0.1% SDS, 50° C.

3) low stringency: 1.0×SSPE, 0.1% SDS, 50° C.

Those of skill in this art know that the washing step selects for stablehybrids and also know the ingredients of SSPE (see, e.g., Sambrook, E.F. Fritsch, T. Maniatis, in: Molecular Cloning, A Laboratory Manual,Cold Spring Harbor Laboratory Press (1989), vol. 3, p. B.13, see, also,numerous catalogs that describe commonly used laboratory solutions).SSPE is pH 7.4 phosphate-buffered 0.18 NaCl. Further, those of skill inthe art recognize that the stability of hybrids is determined by T_(m),which is a function of the sodium ion concentration and temperature(T_(m)=81.5° C.-16.6(log₁₀[Na⁺])+0.41(% G+C)−600/1)), so that the onlyparameters in the wash conditions critical to hybrid stability aresodium ion concentration in the SSPE (or SSC) and temperature.

It is understood that equivalent stringencies can be achieved usingalternative buffers, salts and temperatures. By way of example and notlimitation, procedures using conditions of low stringency are as follows(see also Shilo and Weinberg, Proc. Natl. Acad. Sci. USA 78:6789-6792(1981)): Filters containing DNA are pretreated for 6 hours at 40° C. ina solution containing 35% formamide, 5×SSC, 50 mM Tris-HCl (pH 7.5), 5mM EDTA, 0.1% PVP, 0.1% Ficoll, 1% BSA, and 500 μg/ml denatured salmonsperm DNA (10×SSC is 1.5 M sodium chloride, and 0.15 M sodium citrate,adjusted to a pH of 7).

Hybridizations are carried out in the same solution with the followingmodifications: 0.02% PVP, 0.02% Ficoll, 0.2% BSA, 100 μg/ml salmon spermDNA, 10% (wt/vol) dextran sulfate, and 5-20×10⁶ cpm ³²P-labeled probe isused. Filters are incubated in hybridization mixture for 18-20 hours at40° C., and then washed for 1.5 hours at 55° C. in a solution containing2×SSC, 25 mM Tris-HCl (pH 7.4), 5 mM EDTA, and 0.1% SDS. The washsolution is replaced with fresh solution and incubated an additional 1.5hours at 60° C. Filters are blotted dry and exposed for autoradiography.If necessary, filters are washed for a third time at 65-68° C. andreexposed to film. Other conditions of low stringency which can be usedare well known in the art (e.g., as employed for cross-specieshybridizations).

By way of example and not way of limitation, procedures using conditionsof moderate stringency include, for example, but are not limited to,procedures using such conditions of moderate stringency are as follows:Filters containing DNA are pretreated for 6 hours at 55° C. in asolution containing 6×SSC, 5×Denhart's solution, 0.5% SDS and 100 μg/mldenatured salmon sperm DNA. Hybridizations are carried out in the samesolution and 5-20×10⁶ cpm ³²P-labeled probe is used. Filters areincubated in hybridization mixture for 18-20 hours at 55° C., and thenwashed twice for 30 minutes at 60° C. in a solution containing 1×SSC and0.1% SDS. Filters are blotted dry and exposed for autoradiography. Otherconditions of moderate stringency which can be used are well-known inthe art. Washing of filters is done at 37° C. for 1 hour in a solutioncontaining 2×SSC, 0.1% SDS.

By way of example and not way of limitation, procedures using conditionsof high stringency are as follows: Prehybridization of filterscontaining DNA is carried out for 8 hours to overnight at 65° C. inbuffer composed of 6×SSC, 50 mM Tris-HCl (pH 7.5), 1 mM EDTA, 0.02% PVP,0.02% Ficoll, 0.02% BSA, and 500 μg/ml denatured salmon sperm DNA.Filters are hybridized for 48 hours at 65° C. in prehybridizationmixture containing 100 μg/ml denatured salmon sperm DNA and 5-20×10⁶ cpmof ³²P-labeled probe. Washing of filters is done at 37° C. for 1 hour ina solution containing 2×SSC, 0.01% PVP, 0.01% Ficoll, and 0.01% BSA.This is followed by a wash in 0.1×SSC at 50° C. for 45 minutes beforeautoradiography. Other conditions of high stringency which can be usedare well known in the art.

The term substantially identical or substantially homologous or similarvaries with the context as understood by those skilled in the relevantart and generally means at least 60% or 70%, preferably means at least80%, 85% or more preferably at least 90%, and most preferably at least95% identity.

It is to be understood that the compounds provided herein can containchiral centers. Such chiral centers can be of either the (R) or (S)configuration, or can be a mixture thereof. Thus, the compounds providedherein can be enantiomerically pure, or be stereoisomeric ordiastereomeric mixtures. In the case of amino acid residues, suchresidues can be of either the L- or D-form. In one embodiment, theconfiguration for naturally occurring amino acid residues is L.

As used herein, substantially pure means sufficiently homogeneous toappear free of readily detectable impurities as determined by standardmethods of analysis, such as thin layer chromatography (TLC), gelelectrophoresis, high performance liquid chromatography (HPLC) and massspectrometry (MS), used by those of skill in the art to assess suchpurity, or sufficiently pure such that further purification would notdetectably alter the physical and chemical properties, such as enzymaticand biological activities, of the substance. Methods for purification ofthe compounds to produce substantially chemically pure compounds areknown to those of skill in the art. A substantially chemically purecompound can, however, be a mixture of stereoisomers. In such instances,further purification might increase the specific activity of thecompound.

As used herein, a cleavable bond or moiety refers to a bond or moietythat is cleaved or cleavable under the specific conditions, such aschemically, enzymatically or photolytically. Where not specified herein,such bond is cleavable under conditions of MALDI-MS analysis, such as bya UV or IR laser.

As used herein, a “selectively cleavable” moiety is a moiety that can beselectively cleaved without affecting or altering the composition of theother portions of the compound of interest. For example, a cleavablemoiety L of the compounds provided herein is one that can be cleaved bychemical, enzymatic, photolytic, or other means without affecting oraltering composition (e.g., the chemical composition) of the conjugatedbiomolecule, including a protein. “Non-cleavable” moieties are thosethat cannot be selectively cleaved without affecting or altering thecomposition of the other portions of the compound of interest.

As used herein, binding with high affinity refers to a binding that hasan association constant k_(a) of at least 10⁹ and generally 10¹⁰, 10¹¹liters/mole or greater) or a K_(eq) of 10⁹, 10¹⁰, 10¹¹, 10¹² or greater.For purposes herein, high affinity bonds formed by the reactivity groupsare those that are stable to the laser (UV and IR) used in MALDI-MSanalyses.

As used herein, “alkyl”, “alkenyl” and “alkynyl”, if not specified,contain from 1 to 20 carbons, or 1 to 16 carbons, and are straight orbranched carbon chains. Alkenyl carbon chains are from 2 to 20 carbons,and, in certain embodiments, contain 1 to 8 double bonds. Alkenyl carbonchains of 1 to 16 carbons, in certain embodiments, contain 1 to 5 doublebonds. Alkynyl carbon chains are from 2 to 20 carbons, and, in oneembodiment, contain 1 to 8 triple bonds. Alkynyl carbon chains of 2 to16 carbons, in certain embodiments, contain 1 to 5 triple bonds.Exemplary alkyl, alkenyl and alkynyl groups include, but are not limitedto, methyl, ethyl, propyl, isopropyl, isobutyl, n-butyl, sec-butyl,tert-butyl, isopentyl, neopentyl, tert-penylyl and isohexyl. The alkyl,alkenyl and alkynyl groups, unless otherwise specified, can beoptionally substituted, with one or more groups, including alkyl groupsubstituents that can be the same or different.

As used herein, “lower alkyl”, “lower alkenyl”, and “lower alkynyl”refer to carbon chains having less than about 6 carbons.

As used herein, “alk(en)(yn)yl” refers to an alkyl group containing atleast one double bond and at least one triple bond.

As used herein, an “alkyl group substituent” includes, but is notlimited to, halo, haloalkyl, including halo lower alkyl, aryl, hydroxy,alkoxy, aryloxy, alkyloxy, alkylthio, arylthio, aralkyloxy, aralkylthio,carboxy alkoxycarbonyl, oxo and cycloalkyl.

As used herein, “aryl” refers to aromatic groups containing from 5 to 20carbon atoms and can be a mono-, multicyclic or fused ring system. Arylgroups include, but are not limited to, phenyl, naphthyl, biphenyl,fluorenyl and others that can be unsubstituted or are substituted withone or more substituents.

As used herein, “aryl” also refers to aryl-containing groups, including,but not limited to, aryloxy, arylthio, arylcarbonyl and arylaminogroups.

As used herein, an “aryl group substituent” includes, but is not limitedto, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl,heteroaryl optionally substituted with 1 or more, including 1 to 3,substituents selected from halo, halo alkyl and alkyl, aralkyl,heteroaralkyl, alkenyl containing 1 to 2 double bonds, alkynylcontaining 1 to 2 triple bonds, alk(en)(yn)yl groups, halo, pseudohalo,cyano, hydroxy, haloalkyl and polyhaloalkyl, including halo lower alkyl,especially trifluoromethyl, formyl, alkylcarbonyl, arylcarbonyl that isoptionally substituted with 1 or more, including 1 to 3, substituentsselected from halo, halo alkyl and alkyl, heteroarylcarbonyl, carboxy,alkoxycarbonyl, aryloxycarbonyl, aminocarbonyl, alkyl-aminocarbonyl,dialkylaminocarbonyl, arylaminocarbonyl, diarylaminocarbonyl,aralkylaminocarbonyl, alkoxy, aryloxy, perfluoroalkoxy, alkenyloxy,alkynyloxy, arylalkoxy, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl,arylaminoalkyl, amino, alkylamino, dialkylamino, arylamino,alkylarylamino, alkylcarbonylamino, arylcarbonylamino, azido, nitro,mercapto, alkylthio, arylthio, perfluoroalkylthio, thiocyano,isothiocyano, alkylsulfinyl, alkylsulfonyl, arylsulfinyl, arylsulfonyl,aminosulfonyl, alkylaminosulfonyl, dialkylaminosulfonyl andarylaminosulfonyl.

As used herein, “aralkyl” refers to an alkyl group in that one of thehydrogen atoms of the alkyl is replaced by an aryl group.

As used herein, “heteroaralkyl” refers to an alkyl group in that one ofthe hydrogen atoms of the alkyl is replaced by a heteroaryl group.

As used herein, “cycloalkyl” refers to a saturated mono- or multicyclicring system, in one embodiment, of 3 to 10 carbon atoms, or 3 to 6carbon atoms; cycloalkenyl and cycloalkynyl refer to mono- ormulticyclic ring systems that respectively include at least one doublebond and at least one triple bond. Cycloalkenyl and cycloalkynyl groupscan contain, in one embodiment, 3 to 10 carbon atoms, with cycloalkenylgroups, in other embodiments, containing 4 to 7 carbon atoms andcycloalkynyl groups, in other embodiments, containing 8 to 10 carbonatoms. The ring systems of the cycloalkyl, cycloalkenyl and cycloalkynylgroups can be composed of one ring or two or more rings that can bejoined together in a fused, bridged or spiro-connected fashion, and canbe optionally substituted with one or more alkyl group substituents.“Cycloalk(en)(yn)yl” refers to a cycloalkyl group containing at leastone double bond and at least one triple bond.

As used herein, “heteroaryl” refers to a monocyclic or multicyclic ringsystem, in one embodiment of about 5 to about 15 members where one ormore, or 1 to 3, of the atoms in the ring system is a heteroatom, whichis, an element other than carbon, for example, nitrogen, oxygen andsulfur atoms. The heteroaryl can be optionally substituted with one ormore, including 1 to 3, aryl group substituents. The heteroaryl groupcan be optionally fused to a benzene ring. Exemplary heteroaryl groupsinclude, but are not limited to, pyrroles, porphyrins, furans,thiophenes, selenophenes, pyrazoles, imidazoles, triazoles, tetrazoles,oxazoles, oxadiazoles, thiazoles, thiadiazoles, indoles, carbazoles,benzofurans, benzothiophenes, indazoles, benzimidazoles, benzotriazoles,benzoxatriazoles, benzothiazoles, benzoselenozoles, benzothiadiazoles,benzoselenadiazoles, purines, pyridines, pyridazines, pyrimidines,pyrazines, pyrazines, triazines, quinolines, acridines, isoquinolines,cinnolines, phthalazines, quinazolines, quinoxalines, phenazines,phenanthrolines, imidazinyl, pyrrolidinyl, pyrimidinyl, tetrazolyl,thienyl, pyridyl, pyrrolyl, N-methylpyrrolyl, quinolinyl andisoquinolinyl.

As used herein, “heteroaryl” also refers to heteroaryl-containinggroups, including, but not limited to, heteroaryloxy, heteroarylthio,heteroarylcarbonyl and heteroarylamino.

As used herein, “heterocyclic” refers to a monocyclic or multicyclicring system, in one embodiment of 3 to 10 members, in another embodiment4 to 7 members, including 5 to 6 members, where one or more, including 1to 3 of the atoms in the ring system is a heteroatom, which is, anelement other than carbon, for example, nitrogen, oxygen and sulfuratoms. The heterocycle can be optionally substituted with one or more,or 1 to 3 aryl group substituents. In certain embodiments, substituentsof the heterocyclic group include hydroxy, amino, alkoxy containing 1 to4 carbon atoms, halo lower alkyl, including trihalomethyl, such astrifluoromethyl, and halogen. As used herein, the term heterocycle caninclude reference to heteroaryl.

As used herein, the nomenclature alkyl, alkoxy, carbonyl, etc., are usedas is generally understood by those of skill in this art. For example,as used herein alkyl refers to saturated carbon chains that contain oneor more carbons; the chains can be straight or branched or includecyclic portions or be cyclic.

Where the number of any given substituent is not specified (e.g.,“haloalkyl”), there can be one or more substituents present. Forexample, “haloalkyl” can include one or more of the same or differenthalogens. As another example, “C₁₋₃alkoxyphenyl” can include one or moreof the same or different alkoxy groups containing one, two or threecarbons.

Where named substituents such as carboxy or substituents represented byvariables such as W are separately enclosed in parentheses, yet possessno subscript outside the parentheses indicating numerical value and thatfollow substituents not in parentheses, e.g., “C₁₋₄alkyl(W)(carboxy)”,“W” and “carboxy” are each directly attached to C₁₋₄alkyl.

As used herein, “halogen” or “halide” refers to F, Cl, Br or I.

As used herein, pseudohalides are compounds that behave substantiallysimilar to halides. Such compounds can be used in the same manner andtreated in the same manner as halides (X⁻, in that X is a halogen, suchas Cl or Br). Pseudohalides include, but are not limited to, cyanide,cyanate, isocyanate, thiocyanate, isothiocyanate, selenocyanate,trifluoromethoxy, and azide.

As used herein, “haloalkyl” refers to a lower alkyl radical in that oneor more of the hydrogen atoms are replaced by halogen including, but notlimited to, chloromethyl, trifluoromethyl, 1-chloro-2-fluoroethyl andthe like.

As used herein, “haloalkoxy” refers to RO— in that R is a haloalkylgroup.

As used herein, “sulfinyl” or “thionyl” refers to —S(O)—. As usedherein, “sulfonyl” or “sulfuryl” refers to —S(O)₂—. As used herein,“sulfo” refers to —S(O)₂O—.

As used herein, “carboxy” refers to a divalent radical, —C(O)O—.

As used herein, “aminocarbonyl” refers to —C(O)NH₂.

As used herein, “alkylaminocarbonyl” refers to —C(O)NHR in that R ishydrogen or alkyl, including lower alkyl.

As used herein “dialkylaminocarbonyl” as used herein refers to —C(O)NR′Rin that R′ and R are independently selected from hydrogen or alkyl,including lower alkyl.

As used herein, “carboxamide” refers to groups of formula —N′RCOR.

As used herein, “diarylaminocarbonyl” refers to —C(O)NRR′ in that R andR′ are independently selected from aryl, including lower aryl, such asphenyl.

As used herein, “aralkylaminocarbonyl” refers to —C(O)NRR′ in that oneof R and R′ is aryl, including lower aryl, such as phenyl, and the otherof R and R′ is alkyl, including lower alkyl.

As used herein, “arylaminocarbonyl” refers to —C(O)NHR in that R isaryl, including lower aryl, such as phenyl.

As used herein, “alkoxycarbonyl” refers to —C(O)OR in that R is alkyl,including lower alkyl.

As used herein, “aryloxycarbonyl” refers to —C(O)OR in that R is aryl,including lower aryl, such as phenyl.

As used herein, “alkoxy” and “alkylthio” refer to RO— and RS—, in that Ris alkyl, including lower alkyl.

As used herein, “aryloxy” and “arylthio” refer to RO— and RS—, in that Ris aryl, including lower aryl, such as phenyl.

As used herein, “alkylene” refers to a straight, branched or cyclic, inone embodiment straight or branched, divalent aliphatic hydrocarbongroup, in certain embodiments having from 1 to about 20 carbon atoms, inother embodiments 1 to 12 carbons, including lower alkylene. Thealkylene group is optionally substituted with one or more “alkyl groupsubstituents.” There can be optionally inserted along the alkylene groupone or more oxygen, sulphur or substituted or unsubstituted nitrogenatoms, where the nitrogen substituent is alkyl as previously described.Exemplary alkylene groups include methylene (—CH₂—), ethylene(—CH₂CH₂—), propylene (—(CH₂)₃—), cyclohexylene (—C₆H₁₀—),methylenedioxy (—O—CH₂—O—) and ethylenedioxy (—O—(CH₂)₂—O—). The term“lower alkylene” refers to alkylene groups having 1 to 6 carbons. Incertain embodiments, alkylene groups are lower alkylene, includingalkylene of 1 to 3 carbon atoms.

As used herein, “alkenylene” refers to a straight, branched or cyclic,in one embodiment straight or branched, divalent aliphatic hydrocarbongroup, in certain embodiments having from 2 to about 20 carbon atoms andat least one double bond, in other embodiments 1 to 12 carbons,including lower alkenylene. The alkenylene group is optionallysubstituted with one or more “alkyl group substituents.” There can beoptionally inserted along the alkenylene group one or more oxygen,sulphur or substituted or unsubstituted nitrogen atoms, where thenitrogen substituent is alkyl as previously described. Exemplaryalkenylene groups include —CH═CH—CH═CH— and —CH═CH—CH₂—. The term “loweralkenylene” refers to alkenylene groups having 2 to 6 carbons. Incertain embodiments, alkenylene groups are lower alkenylene, includingalkenylene of 3 to 4 carbon atoms.

As used herein, “alkynylene” refers to a straight, branched or cyclic,in one embodiment straight or branched, divalent aliphatic hydrocarbongroup, in certain embodiments having from 2 to about 20 carbon atoms andat least one triple bond, in other embodiments 1 to 12 carbons,including lower alkynylene. The alkynylene group is optionallysubstituted with one or more “alkyl group substituents.” There can beoptionally inserted along the alkynylene group one or more oxygen,sulphur or substituted or unsubstituted nitrogen atoms, where thenitrogen substituent is alkyl as previously described. Exemplaryalkynylene groups include —C≡C—C≡C—, —C≡C— and —C≡C—CH₂—. The term“lower alkynylene” refers to alkynylene groups having 2 to 6 carbons. Incertain embodiments, alkynylene groups are lower alkynylene, includingalkynylene of 3 to 4 carbon atoms.

As used herein, “alk(en)(yn)ylene” refers to a straight, branched orcyclic, in one embodiment straight or branched, divalent aliphatichydrocarbon group, in certain embodiments having from 2 to about 20carbon atoms and at least one triple bond, and at least one double bond;in other embodiments 1 to 12 carbons, including lower alk(en)(yn)ylene.The alk(en)(yn)ylene group is optionally substituted with one or more“alkyl group substituents.” There can be optionally inserted along thealkynylene group one or more oxygen, sulphur or substituted orunsubstituted nitrogen atoms, where the nitrogen substituent is alkyl aspreviously described. Exemplary alk(en)(yn)ylene groups include—C═C—(CH₂)_(n)—C≡C—, where n is 1 or 2. The term “loweralk(en)(yn)ylene” refers to alk(en)(yn)ylene groups having up to 6carbons. In certain embodiments, alk(en)(yn)ylene groups are loweralk(en)(yn)ylene, including alk(en)(yn)ylene of 4 carbon atoms.

As used herein, “arylene” refers to a monocyclic or polycyclic, in oneembodiment monocyclic, divalent aromatic group, in certain embodimentshaving from 5 to about 20 carbon atoms and at least one aromatic ring,in other embodiments 5 to 12 carbons, including lower arylene. Thearylene group is optionally substituted with one or more “alkyl groupsubstituents.” There can be optionally inserted around the arylene groupone or more oxygen, sulphur or substituted or unsubstituted nitrogenatoms, where the nitrogen substituent is alkyl as previously described.Exemplary arylene groups include 1,2-, 1,3- and 1,4-phenylene. The term“lower arylene” refers to arylene groups having 5 or 6 carbons. Incertain embodiments, arylene groups are lower arylene.

As used herein, “heteroarylene” refers to a divalent monocyclic ormulticyclic ring system, in one embodiment of about 5 to about 15members where one or more, or 1 to 3 of the atoms in the ring system isa heteroatom, which is, an element other than carbon, for example,nitrogen, oxygen and sulfur atoms. The heteroarylene group can beoptionally substituted with one or more, or 1 to 3, aryl groupsubstituents.

As used herein, “alkylidene” refers to a divalent group, such as ═CR′R″,which is attached to one atom of another group, forming a double bond.Exemplary alkylidene groups are methylidene (═CH₂) and ethylidene(═CHCH₃). As used herein, “aralkylidene” refers to an alkylidene groupin that either R′ or R″ is and aryl group.

As used herein, “amido” refers to the divalent group —C(O)NH—.“Thioamido” refers to the divalent group —C(S)NH—. “Oxyamido” refers tothe divalent group —OC(O)NH—. “Thiaamido” refers to the divalent group—SC(O)NH—. “Dithiaamido” refers to the divalent group —SC(S)NH—.“Ureido” refers to the divalent group —HNC(O)NH—. “Thioureido” refers tothe divalent group —HNC(S)NH—.

As used herein, “semicarbazide” refers to —NHC(O)NHNH—. “Carbazate”refers to the divalent group —OC(O)NHNH—. “Isothiocarbazate” refers tothe divalent group —SC(O)NHNH—. “Thiocarbazate” refers to the divalentgroup —OC(S)NHNH—. “Sulfonylhydrazide” refers to the group —SO₂NHNH—.“Hydrazide” refers to the divalent group —C(O)NHNH—. “Azo” refers to thedivalent group —N═—. “Hydrazinyl” refers to the divalent group —NH—NH—.

As used herein, the term “amino acid” refers to α-amino acids that areracemic, or of either the D- or L-configuration. The designation “d”preceding an amino acid designation (e.g., dAla, dSer, dVal, etc.)refers to the D-isomer of the amino acid. The designation “dl” precedingan amino acid designation (e.g., dlAla) refers to a mixture of the L-and D-isomers of the amino acid.

As used herein, when any particular group, such as phenyl or pyridyl, isspecified, this means that the group is unsubstituted or is substituted.Substituents where not specified are halo, halo lower alkyl, and loweralkyl.

As used herein, conformationally altered protein disease (or a diseaseof protein aggregation) refers to diseases associated with a protein orpolypeptide that has a disease-associated conformation. The methods andcollections provided herein permit detection of a conformer associatedwith a disease to be detected. Diseases and associated proteins thatexhibit two or more different conformations in which at least oneconformation is a conformationally altered protein, include, but are notlimited to amyloid diseases and other neurodegenerative diseases knownto those of skill in the art and set forth below.

As used herein, cell sorting refers to an assay in which cells areseparated and recovered from suspension based upon properties measuredin flow cytometry analysis. Most assays used for analysis can serve asthe basis for sorting experiments, as long as gates and regions definingthe subpopulation(s) to be sorted do not logically overlap. Maximumthroughput rates are typically 5000 cells/second (18×10⁶ cells/hour).The rate of collection of the separated population(s) depends primarilyupon the condition of the cells and the percentage of reactivity.

As used herein, the abbreviations for any protective groups, amino acidsand other compounds, are, unless indicated otherwise, in accord withtheir common usage, recognized abbreviations, or the IUPAC-IUBCommission on Biochemical Nomenclature (see, Biochem. 1972, 11:942). Forexample, DMF=N,N-dimethylformamide, DMAc=N,N-dimethylacetamide;THF=tetrahydrofuran; TRIS=tris(hydroxymethyl)aminomethane;SSPE=saline-sodium phosphate-EDTA buffer;EDTA=ethylenediaminetetraacetic acid; SDS=sodium dodecyl sulfate.

B. Collections of Capture Compounds

Collections of capture compounds that selectively bind to biomoleculesin samples, such as biomoelcules, particularly, although notexclusively, a cell lysate or in vitro translated polypeptides from acell lysate are provided. Each capture compound in the collection canbind to specific groups or classes of biopolymers, and is designed tocovalently or tightly (sufficient to sustain mass spectrometricanalysis, for example) to a subset of all of the biomolecules in thesample. For example, a sample can contain 1000's of members, for examplea cell lysate. The collections of compounds permit sufficientselectivity so that, for example, about 10-20 of the components of thesample bind to each member of the collection. The exact number is asmall enough number for routine analyses to identify them, generally inone step, such as by mass spectrometry.

The collections permit a top down holistic approach to analysis of theproteome, including post-translationally modified proteins, and otherbiomolecules. Protein and other biomolecule patterns are the startingpoint for analyses that use these collections; rather than nucleic acidsand the genome (bottom up). The collections can be used to assess thebiomolecule components of a sample, such as a biological sample, toidentify components specific to a particular phenotype, such as adisease state, to identify structural function, biochemical pathways andmechanisms of action. The collections and methods of use permit anunbiased analysis of biomolecules, since the methods do not necessarilyassess specific classes of targets, instead, changes in samples aredetected or identified. The collections permit the components of acomplex mixture of biomolecules (i.e., a mixture of 50, 100, 500, 1000,2000 and more) to be sorted into discrete loci containing reducednumbers, typically by 10%, 50% or greater reduction in complexity, or toabout 1 to 50 different biomolecules per locus in an array, so that thecomponents at each spot can be analyzed, such as by mass spectrometricanalysis alone or in combination with other analyses. In someembodiments, such as for phenotypic analyses, homogeneity of thestarting sample, such as cells, can be important. To providehomogeneity, cells, with different phenotypes, such as diseased versushealthy, from the same individual are compared. Methods for doing so areprovided herein.

By virtue of the structure of compounds in the collections, thecollections can be used to detect structural changes, such as those fromthe post-translational processing of proteins, and can be used to detectchanges in membrane proteins, which are involved in the most fundamentalprocesses, such as signal transduction, ion channels, receptors forligand interaction and cell-to-cell interactions. When cells becomediseased, changes associated with disease, such as transformation, oftenoccur in membrane proteins.

The collections contain sets of member capture compounds. In general,members of each set differ in at least one functional group, andgenerally in two or three, from members of the other sets. Thus, forexample, if the compounds include a reactivity function, a selectivityfunction and a sorting function, each set differs in at least thesorting function, typically in at least in the sorting and selectivityfunction, and generally in all three functions. The solubilityfunctions, if present, which are selected to permit assaying in aselected environment, can differ among the compounds, or can be the sameamong all sets.

In practicing methods, the collections are contacted with a sample orpartially purified or purified components thereof to effect binding ofbiomolecules to capture compounds in the collection. The capturecompounds can be in an addressable array, such as bound to a solidsupport prior to contacting, or can be arrayed after contacting with thesample. The resulting array is optionally treated with a reagent thatspecifically cleaves the bound polymers, such as a protease, and issubjected to analysis, particularly mass spectrometric analysis toidentify components of the bound biomolecules at each locus. Once amolecular weight of a biomolecule, such as a protein or portion thereofof interest is determined, the biomolecule can be identified. Methodsfor identification include comparison of the molecular weights withdatabases, for example protein databases that include protease fragmentsand their molecular weights.

The capture compounds that include functional groups that conferreactivity, selective and separative properties, depending on thespecificity of separation and analysis required (which depends on thecomplexity of the mixture to be analyzed). As more functional groups areadded to the compounds, the compounds can exhibit increased selectivityand develop a signature for target molecules similar to a an antigen(Ag) binding site on an antibody. In general, the compounds providedherein include at least two functional groups (functions) selected fromfour types of functions: a reactivity function, which binds tobiopolymers either covalently or with a high k_(a) (generally greaterthan about 10⁹, 10¹⁰, 10¹² liters/mole and/or such that the binding issubstantially irreversible or stable under conditions of massspectrometric analyses, such as MALDI-MS conditions); a selectivityfunction, which by virtue of non-covalent interactions alters, generallyincreases, the specificity of the reactivity function; a sortingfunction, which permits the compounds to be addressed (arrayed orotherwise separated based according to the structure of the capturecompound; and a solubility function, which when selected alters thesolubility of the compounds depending upon the environment in whichreactions are performed, permitting the conditions to simulatephysiological conditions. In general, the reactivity function is areactive group that specifically interacts, typically covalently or withhigh binding affinity (k_(a)), with particular biomolecules, such asproteins, or portions thereof; and the other functionality, theselectivity functions, alters, typically increasing, the specificity ofthe reactivity function. In general, the reactive function covalentlyinteracts with groups on a particular biomolecule, such as amine groupson the surface of a protein. The reactivity function interacts withbiomolecules to form a covalent bond or a non-covalent bond that isstable under conditions of analysis, generally with a k_(a) of greaterthan 10⁹ liters/mole or greater than 10¹⁰ liters/mole. Conditions ofanalysis include, but are not limited to, mass spectrophotometricanalysis, such as matrix assisted laser desorption ionization-time offlight (MALDI-TOF) mass spectrometry. The selectivity functioninfluences the types of biomolecules that can interact with thereactivity function through a non-covalent interaction. The selectivityfunction alters the specificity for the particular groups, generallyreducing the number of such groups with which the reactivity functionsreact. A goal is to reduce the number of proteins or biomolecules boundat a locus, so that the proteins can then be separated, such as by massspectrometry.

Included among the capture compounds provided herein are those that can,the compounds for use in the methods herein can be classified in atleast two sets: one for reactions in aqueous solution (e.g., forreaction with hydrophilic biomolecules), and the other for reaction inorganic solvents (e.g., chloroform) (e.g., for reaction with hydrophobicbiomolecules). Thus, in certain embodiments, the compounds providedherein discriminate between hydrophilic and hydrophobic biomolecules,including, but not limited to, proteins, and allow for analysis of bothclasses of biomolecules.

C. Capture Compounds

Capture compounds (also referred to as capture agents) are provided. Thecapture compounds include a core “Z” that presents one or morereactivity functions “X” and optionally at least a selectivity function“Y” and/or a sorting function “Q”, and also optionally one or moresolubility functions “W.” Additionally, cleavable linkers and otherfunctions are included in the molecules. The particular manner in whichthe functions are presented on the core or scaffold is a matter ofdesign choice, but are selected such that the resulting molecule has theproperty that it captures biomolecules, particularly proteins, withsufficient specificity and either covalently or with bonds of sufficientstability or affinity to permit analysis, such as by mass spectrometry,including MALDI mass spectrometric analysis, so that at least a portionof bound biomolecules remain bound (generally a binding affinity of 10⁹,10¹⁰, 10¹¹ liters/mole or greater, or a K_(eq) of 10⁹, 10¹⁰, 10¹¹, 10¹²or greater).

X, the reactivity functionality, is selected to be anything that formssuch a covalent bond or a bond of high affinity that is stable underconditions of mass spectrometric analysis, particularly MALDI analysis.The selectivity functionality Y, is a group that “looks” at the topologyof the protein around reactivity binding sites and functions to selectparticular groups of biomolecules from among those with which areactivity group can form a covalent bond (or high affinity bond). Forexample, a selectivity group can cause steric hindrance, or permitspecific binding to an epitope, or anything in between. It can be asubstrate for a drug, lipid, or peptide. It selects the environment ofthe groups with which the reactivity function interacts. The selectivityfunctionality Y, can be one whereby a capture compound forms a covalentbond with a biomolecule in a mixture or interacts with high stabilitysuch that the affinity of binding of the capture compound to thebiomolecule through the reactive functionality in the presence of theselectivity functionality is at least ten-fold or 100-fold greater thanin the absence of the selectivity functionality.

Q is a sorting function that can be anything that provides a means forseparating each set of capture compounds from the others, such as byarraying, and includes, groups such as biotin, generally a spacer,binding to an avidin on a surface (or vice versa) array,oligonucleotides for binding oligonucleotide arrays; any molecule thathas a cognate binding partner to which it binds with sufficient affinityto survive mass spectrometric analysis, such as MALDI-MS analysis, canbe selected. For any collection a variety of different sorting groupscan be used; each set of capture compounds should have unique Q comparedto the other sets. In addition, labeling means that can be sorted byvirtue of the label, such as RF tags, fluorescent tags, color-coded tagsor beads, bar-coded or other symbology labeled tags and other suchlabels can be used. For example, the capture compounds or the X, Y, Z, Wfunctionalities can be on a surface that is attached to an RF tag or acolored tag. These can be readily sorted after reaction so that each setcan be separately analyzed to identify bound biomolecules. Thus, thecollections can include capture compounds that have a variety of sortinggroups.

The solubility function, W, permits alteration in properties of thecapture compound components of the collection. For example, W can beselected so that the capture compounds are soluble or not in aparticular reaction medium or environment, such as a hydrophobicenvironment, thereby permitting reactions with membrane components. Thecollections include sets of capture compounds, each of which set differsin Q and at least one or both X and Y.

As noted, among the capture compounds provided are those with at leastthree functionalities: reactivity and sorting and solubility. Thesorting function can be selectively cleavable to permit its removal.These compounds also can include a selectivity function to alter therange of binding of the reactivity function, which binds eithercovalently or with high affinity (k_(a) greater than 10⁹ tobiomolecules, and optionally one or both of a sorting and solubilityfunction.

More detailed description and discussion of each functionality andnon-limiting exemplary embodiments follow.

1. Z, the Core

Generally all compounds include a function, even if it is one atom, suchas carbon, for presenting the functional groups. In certain embodimentsherein, in the capture compounds for use in the methods provided herein,Z is a moiety that is cleavable prior to or during analysis of thebiomolecule, including mass spectral analysis, without altering thechemical structure of the biomolecule, including, but not limited to, aprotein.

For example, in some embodiments, the methods provided herein include astep of mass spectral analysis of biomolecules, including proteins,which are displayed in an addressable format. In certain embodiments,the compounds are then bound to an array of single oligonucleotides thatinclude single-stranded portions (or portions that can be madesingle-stranded) that are complementary to the oligonucleotide portions,or oligonucleotide analog portions, (Q, the sorting function) of thecapture compounds. In these embodiments, Z can be selected to be a groupthat is (i) stable to the reaction conditions required for reaction ofthe compounds provided herein with the biomolecule, such as a protein,(ii) stable to the conditions required for hybridization of the Q moietywith the single stranded oligonucleotides, and (iii) cleavable prior toor during analysis of the biomolecule.

In another embodiment, Z with the linked functional groups can bedesigned so that with the Q, X, W and/or Y it dissolved into lipidbilayers of a cell membrane, thereby contacting internal portions ofcell membrane proteins through the X and Y functions. In thisembodiment, the support captures proteins, such as membrane proteins andorganelle proteins, including proteins within cell membranes. Thecapture compounds and functional group can be selected so that theresulting capture compounds function under selected physiologicalconditions. Thus, the choice of Z, Q, X, W and/or Y allows for design ofsurfaces and supports that mimic cell membranes and other biologicalmembranes.

In some embodiments, a lipid bilayer, such as those used for formingliposomes and other micelles, can be provided on the surface of asupport as a way of maintaining the structures of membrane proteins tomake a lipid bilayer on the surface. This can be employed where thesupport is the “Z” function and the other functions are linked thereto,or where the compounds are linked to a support through a Q group, suchas by double-stranded oligonucleotides. The resulting immobilizedcapture compounds can be coated with or dissolved in a lipid coating. Asa result compounds and collections provided herein can act as anartificial membrane, dendrimer polymer chemistry can be employed forcontrolled synthesis of membranes having consistent pore dimensions andmembrane thicknesses, through synthesis of amphiphilic dendrimeric orhyperbranched block copolymers that can be self-assembled to formultrathin organic film membranes on porous supports. In one embodiment,an organic film membrane is composed of a linear-dendritic diblockcopolymer composed of polyamidoamine (PAMAM) dendrimer attached to oneend of a linear polyethylene oxide (PEO) block.

Z is Cleavable Under the Conditions of Mass Spectrometric Analysis

In one such embodiment, Z is a photocleavable group that is cleaved by alaser used in MALDI-TOF mass spectrometry. In another embodiment, Z isan acid labile group that is cleaved upon application of a matrix formass spectrometric analysis to arrayed, such as hybridizedcompound-biomolecule conjugates, or by exposure to acids (e.g.,trifluoroacetic or hydrochloric acids) in a vapor or liquid form, priorto analysis. In this embodiment, the matrix maintains the spacialintegrity of the array, allowing for addressable analysis of the array.

Z is not Cleavable Under the Conditions of Mass Spectrometric Analysis

In certain embodiments, the capture compounds for use in the methodsprovided herein have a Z moiety that is not cleavable under conditionsused for analysis of biomolecules, including, but not limited to, massspectrometry, such as matrix assisted laser desorption ionization-timeof flight (MALDI-TOF) mass spectrometry. Capture compounds of theseembodiments can be used, for example, in methods provided herein foridentifying biomolecules in mixtures thereof; for determiningbiomolecule-biomolecule, including protein-protein, interactions, andfor determining biomolecule-small molecule, including protein-drug orprotein-drug candidate, interactions. In these embodiments, it is notnecessary for the Z group to be cleaved for the analysis.

Thus, as noted, Z can be virtually any moiety that serves as a core topresent the binding (the selectivity and reactivity functions) and thesolubility and sorting functions. A variety are exemplified herein, butothers may be substituted. The precise nature can be a matter of designchoice in view of the disclosure herein and the skill of the skilledartisan

a. Divalent Z Moieties

In one embodiment, Z is a cleavable or non-cleavable divalent group thatcontains, generally 50 or fewer, or less than 20 members, and isselected from straight or branched chain alkylene, straight or branchedchain alkenylene, straight or branched chain alkynylene, straight orbranched chain alkylenoxy, straight or branched chain alkylenthio,straight or branched chain alkylencarbonyl, straight or branched chainalkylenamino, cycloalkylene, cycloalkenylene, cycloalkynylene,cycloalkylenoxy, cycloalkylenthio, cycloalkylencarbonyl,cycloalkylenamino, heterocyclylene, arylene, arylenoxy, arylenthio,arylencarbonyl, arylenamino, heteroarylene, heteroarylenoxy,heteroarylenthio, heteroarylencarbonyl, heteroarylenamino, oxy, thio,carbonyl, carbonyloxy, ester, amino, amido, phosphino, phosphineoxido,phosphoramidato, phosphinamidato, sulfonamido, sulfonyl, sulfoxido,carbamato, ureido, and combinations thereof, and is optionallysubstituted with one or more, including one, two, three or four,substituents each independently selected from Y, as described elsewhereherein.

In other embodiments, Z is a divalent cleavable or non-cleavable groupselected from straight or branched chain alkyl, straight or branchedchain alkenyl, straight or branched chain alkynyl, —(C(R¹⁵)₂)_(d)—, —O—,—S—, —(CH₂)_(d)—, —(CH₂)_(d)O—, —(CH₂)_(d)S—, >N(R¹⁵), —(S(O)_(u))—,—(S(O)₂)_(w)—, >C(O), —(C(O))_(w)—, —(C(S(O)_(u)))_(w)—, —(C(O)O)_(w)—,—(C(R¹⁵)₂)_(d)O—, —(C(R¹⁵)₂)_(d)S(O)_(u)—, —O(C(R¹⁵)₂)_(d)—,—S(O)_(u)(C(R¹⁵)₂)_(d)—, —(C(R¹⁵)₂)_(d)O(C(R¹⁵)₂)_(d)—,—(C(R¹⁵)₂)_(d)S(O)_(u)(C(R¹⁵)₂)_(d)—, —N(R¹⁵)(C(R¹⁵)₂)_(d)—,—(C(R¹⁵)₂)_(d)NR¹⁵—, —(C(R¹⁵)₂)_(d)N(R¹⁵)(C(R¹⁵)₂)_(d)—,—(S(R¹⁵)(O_(u))_(w)—, —(C(R¹⁵)₂)_(d)—, —(C(R¹⁵)₂)_(d)O(C(R¹⁵)₂)_(d)—,—(C(R¹⁵)₂)_(d)(C(O)O)_(w)(C(R¹⁵)₂)_(d)—, —(C(O)O)_(w)(C(R¹⁵)₂)_(d)—,—(C(R¹⁵)₂)_(d)(C(O)O)_(w)—, —(C(S)(R¹⁵)_(w)—, —(C(O))_(w)(CR¹⁵ ₂)_(d),—(CR¹⁵)_(d)(C(O))_(w)(CR¹⁵)_(d)—, —(C(R¹⁵)₂)_(d)(C(O))_(w)—,—N(R¹⁵)(C(R¹⁵)₂)_(w)—, —OC(R¹⁵)₂C(O)—, —O((R¹⁵)₂C(O)N(R¹⁵)—,—(C(R¹⁵)₂)_(w)N(R¹⁵)(C(R¹⁵)₂)_(w)—, —(C(R¹⁵)₂)_(w)N(R¹⁵)—,>P(O)_(v)(R¹⁵)_(x), >P(O)_(u)(R¹⁵)₃>P(O)_(u)(C(R¹⁵)₂)_(d), >Si(R¹⁵)₂ andcombinations of any of these groups;

where u, v and x are each independently 0 to 5;

each d is independently an integer from 1 to 20, or 1 to 12, or 1-6, or1 to 3;

each w is independently an integer selected from 1 to 6, or 1 to 3, or 1to 2; and

each R¹⁵ is independently a monovalent group selected from straight orbranched chain alkyl, straight or branched chain alkenyl, straight orbranched chain alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl,heterocyclyl, straight or branched chain heterocyclylalkyl, straight orbranched chain heterocyclylalkenyl, straight or branched chainheterocyclylalkynyl, aryl, straight or branched chain arylalkyl,straight or branched chain arylalkenyl, straight or branched chainarylalkynyl, heteroaryl, straight or branched chain heteroarylalkyl,straight or branched chain heteroarylalkenyl, straight or branched chainheteroarylalkynyl, halo, straight or branched chain haloalkyl,pseudohalo, azido, cyano, nitro, OR⁶⁰, NR⁶⁰R⁶¹, COOR⁶⁰, C(O)R⁶⁰,C(O)NR⁶⁰R⁶¹, S(O)_(q)R⁶⁰, S(O)_(q)OR⁶⁰, S(O)_(q)NR⁶⁰R⁶¹, NR⁶⁰C(O)R⁶¹,NR⁶⁰C(O)NR⁶⁰R⁶¹, NR⁶⁰S(O)_(q)R⁶⁰, SiR⁶⁰R⁶¹R⁶², P(R⁶⁰)₂, P(O)(R⁶⁰ ₂),P(O)(OR⁶⁰)₂, P(O)(OR⁶⁰)(R⁶¹) and P(O)NR⁶⁰R⁶¹, where q is an integer from0 to 2;

each R⁶⁰, R⁶¹, and R⁶² is independently hydrogen, straight or branchedchain alkyl, straight or branched chain alkenyl, straight or branchedchain alkynyl, aryl, straight or branched chain aralkyl, straight orbranched chain aralkenyl, straight or branched chain aralkynyl,heteroaryl, straight or branched chain heteroaralkyl, straight orbranched chain heteroaralkenyl, straight or branched chainheteroaralkynyl, heterocyclyl, straight or branched chainheterocyclylalkyl, straight or branched chain heterocyclylalkenyl orstraight or branched chain heteorcyclylalkynyl.

In other embodiments, Z is a cleavable or non-cleavable divalent grouphaving any combination of the following groups: arylene, heteroarylene,cycloalkylene, >C(R¹⁵)₂, —C(R¹⁵)═C(R¹⁵)—, >C═C(R²³)(R²⁴), >C(R²³)(R²⁴),—C≡C—, —O—, >S(A)_(u), >P(D)_(v)(R¹⁵), >P(D)_(v)(ER¹⁵), >N(R¹⁵),>N⁺(R²³)(R²⁴), >Si(R¹⁵)₂ or >C(E); where u is 0, 1 or 2; v is 0, 1, 2 or3; A is —O— or —NR¹⁵; D is —S— or —O—; and E is —S—, —O— or —NR¹⁵; thatgroups can be combined in any order;

each R¹⁵ is a monovalent group independently selected from the groupconsisting of hydrogen and V—R¹⁸;

each V is a divalent group independently having any combination of thefollowing groups: a direct link, arylene, heteroarylene, cycloalkylene,>C(R¹⁷)₂, —C(R¹⁷)═C(R¹⁷)—, >C═C(R²³)(R²⁴), >C(R²³)(R²⁴), —C≡C—, —O—,>S(A)_(u), >P(D)_(v)(R¹⁷), >P(D)_(v)(ER¹⁷), >N(R¹⁷), >N(COR¹⁷),>N⁺(R²³)(R²⁴), >Si(R¹⁷)₂ and >C(E); where u is 0, 1 or 2; v is 0, 1, 2or 3; A is —O— or —NR¹⁷; D is —S— or —O—; and E is —S—, —O— or —NR¹⁷;that groups can be combined in any order;

R¹⁷ and R¹⁸ are each independently selected from the group consisting ofhydrogen, halo, pseudohalo, cyano, azido, nitro, —SiR²⁷R²⁸R²⁵, alkyl,alkenyl, alkynyl, haloalkyl, haloalkoxy, aryl, aralkyl, aralkenyl,aralkynyl, heteroaryl, heteroaralkyl, heteroaralkenyl, heteroaralkynyl,heterocyclyl, heterocyclylalkyl, heterocyclylalkenyl,heterocyclylalkynyl, hydroxy, alkoxy, aryloxy, aralkoxy, heteroaralkoxyand —NR¹⁹R²⁰;

R¹⁹ and R²⁰ are each independently selected from hydrogen, alkyl,alkenyl, alkynyl, cycloalkyl, aryl, aralkyl, heteroaryl, heteroaralkyland heterocyclyl;

R²³ and R²⁴ are selected from (i) or (ii) as follows:

(i) R²³ and R²⁴ are independently selected from the group consisting ofhydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, aryl and heteroaryl; or

(ii) R²³ and R²⁴ together form alkylene, alkenylene or cycloalkylene;

R²⁵, R²⁷ and R²⁸ are each independently a monovalent group selected fromhydrogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkoxy, aryl, aralkyl,aralkenyl, aralkynyl, heteroaryl, heteroaralkyl, heteroaralkenyl,heteroaralkynyl, heterocyclyl, heterocyclylalkyl, heterocyclylalkenyl,heterocyclylalkynyl, hydroxy, alkoxy, aryloxy, aralkoxy, heteroaralkoxyand —NR¹⁹R²⁰;

R¹⁵, R¹⁷, R¹⁸, R¹⁹, R²⁰, R²³, R²⁴, R²⁵, R²⁷ and R²⁸ can be substitutedwith one or more substituents each independently selected from Z², inthat Z² is selected from alkyl, alkenyl, alkynyl, aryl, cycloalkyl,cycloalkenyl, hydroxy, —S(O)_(h)R³⁵ in that h is 0, 1 or 2, —NR³⁵R³⁶,—COOR³⁵, —COR³⁵, —CONR³⁵R³⁶, —OC(O)NR³⁵R³⁶, —N(R³⁵)C(O)R³⁶, alkoxy,aryloxy, heteroaryl, heterocyclyl, heteroaryloxy, heterocyclyloxy,aralkyl, aralkenyl, aralkynyl, heteroaralkyl, heteroaralkenyl,heteroaralkynyl, aralkoxy, heteroaralkoxy, alkoxycarbonyl, carbamoyl,thiocarbamoyl, alkoxycarbonyl, carboxyaryl, halo, pseudohalo, haloalkyland carboxamido;

R³⁵ and R³⁶ are each independently selected from among hydrogen, halo,pseudohalo, cyano, azido, nitro, trialkylsilyl, dialkylarylsilyl,alkyldiarylsilyl, triarylsilyl, alkyl, alkenyl, alkynyl, haloalkyl,haloalkoxy, aryl, aralkyl, aralkenyl, aralkynyl, heteroaryl,heteroaralkyl, heteroaralkenyl, heteroaralkynyl, heterocyclyl,heterocyclylalkyl, heterocyclylalkenyl, heterocyclylalkynyl, hydroxy,alkoxy, aryloxy, aralkoxy, heteroaralkoxy, amino, amido, alkylamino,dialkylamino, alkylarylamino, diarylamino and arylamino.

In certain embodiments herein, the compounds are selected with theproviso that Z is cleavable prior to or during analysis, including massspectral analysis, such as matrix assisted laser desorptionionization-time of flight (MALDI-TOF) mass spectrometry, of thebiomolecule.

In certain embodiments, Z is at least a trivalent moiety selected fromthe divalent moieties disclosed herein absent at least one hydrogen. Thecapture compounds in the collections provided herein include a core Zthat has a variety of valencies. Among the capture compounds are thosein which Z is at least trivalent. Also among the compounds in thecollections are those where Z is divalent and linked to either a Q andan X, or a Q and a Y, or an X and a Y, or other combination of thefunctionalities provided herein.

(i) Cleavable Divalent Z Moieties

In one embodiment, Z is a cleavable divalent moiety and has the formula:—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)-L-,where S¹ and S² are spacer moieties; t and b are each independently 0 or1; M is a central moiety possessing two or more points of attachment(i.e., divalent or higher valency); in certain embodiments, two to sixpoints of attachment (i.e., divalent to hexavalent), in otherembodiments, 2, 3, 4 or 5 points of attachment (i.e., divalent,trivalent, tetravalent or pentavalent); R¹⁵ is as described above; a is0 to 4, in certain embodiments, 0, 1 or 2; and L is a bond that iscleavable prior to or during analysis, including mass spectral analysis,of a biomolecule without altering the chemical structure of thebiomolecule, such as a protein.

(a) M

In certain embodiments, M is alkylene, phenylene, biphenylene or adivalent heterobifunctional trityl derivative. M is unsubstituted or issubstituted with 1 to 4 groups, each independently selected from R¹⁵.

In other embodiments, M is selected from —(CH₂)_(r)—, —(CH₂O)_(r),—(CH₂CH₂—O)_(r)—, —(NH—(CH₂)_(r)C(═O))_(s)—, —(NH—CH(R⁵²)—C(═O))_(r)—,—(O(CH)_(r)—C(═O))_(s)—,

where R¹⁵ is as defined above; r and s are each independently an integerfrom 1 to 10; R⁵² is the side chain of a natural α-amino acid; and z isan integer from 1 to 4. In one embodiment, z is 1.

In certain embodiments, R¹⁵ is —H, —OH, —OR⁵¹, —SH, —SR⁵¹, —NH₂, —NHR⁵¹,—N(R⁵¹)₂, —F, —Cl, —Br, —I, —SO₃H, —PO⁻² ₄, —CH₃, —CH₂CH₃, —CH(CH₃)₂ or—C(CH₃)₃; where R⁵¹ is straight or branched chain alkyl, straight orbranched chain alkenyl, straight or branched chain alkynyl, aryl,heteroaryl, cycloalkyl, heterocyclyl, straight or branched chainaralkyl, straight or branched chain aralkenyl, straight or branchedchain aralkynyl, straight or branched chain heteroaralkyl, straight orbranched chain heteroaralkenyl, straight or branched chainheteroaralkynyl, straight or branched chain cycloalkylalkyl, straight orbranched chain cycloalkylalkenyl, straight or branched chaincycloalkylalkynyl, straight or branched chain heterocyclylalkyl,straight or branched chain heterocyclylalkenyl or straight or branchedchain heterocyclylalkynyl.

(b) S¹ and S²

Optionally, a spacer region S¹ and/or S² can be present on either orboth sides of the central moiety M (linked to Z) of the compounds, forexample, to reduce steric hindrance in reactions with the surface oflarge biomolecules and/or for facilitating sorting. These can be anygroups that provide for spacing, typically without altering desiredfunctional properties of the capture compounds and/or capturecompound/biomolecule complexes. Those of skill in the art in light ofthe disclosure herein, can readily select suitable spacers. Exemplaryspacers are set forth below.

For embodiments, for example, where the biomolecule and the sortingfunction possess low steric hinderance, a spacer is optional. In certainembodiments, steric hindrance also can enhance selectivity inconjunction with Y (or in the absence of a Y). This enhanced selectivitycan be achieved either by the presence of a selectivity function, Y,that is attached to M or by the selection of the appropriate spacermolecules for S¹ and/or S².

If S² is not required, the reactivity of the cleavable bond L can beinfluenced by one or more substituted functionalities, for example, R¹⁵on M. Electronic (e.g., mesomeric, inductive) and/or steric effects canbe used to modulate the stability of the cleavable bond L. For example,if M is a trityl derivative, the linkage to the biomolecule, including,but not limited to, a protein, is in one embodiment a trityl ether bond.The sensitivity of this bond to mild acids, such as acetic acid or thevapor of trifluoroacetic acid, can be significantly enhanced by havingas R¹⁵ one or two electron donating groups, including, but not limitedto, alkoxy groups, such as methoxy groups, in the para positions of thearyl rings. Alternatively, the trityl ether bond can be stabilized bythe introduction of electron withdrawing groups, including, but notlimited to, either halogen, including bromo and chloro, groups, nitrogroups or ester moieties, in the para and/or ortho positions of thearomatic rings.

In certain embodiments, S¹ and S² are each independently selected from—(CH₂)_(r)—, —(CH₂O)—, —(CH₂CH₂—O)_(r)—, —(NH—(CH₂)_(r)—C(═O))_(s)—,—(NH—CH(R⁵²)—C(═O))_(s)—, —(O—(CH)_(r)—C(═O))_(s)—,

where R¹⁵ is selected as above; r and s are each independently aninteger from 1 to 10; R⁵² is the side chain of a natural α-amino acid;and y is an integer from 0 to 4. In one embodiment, y is 0 or 1.

In certain embodiments, R¹⁵ is —H, —OH, —OR⁵¹, —SH, —SR⁵¹, —NH₂, —NHR⁵¹,—NR⁵¹ ₂, —F, —Cl, —Br, —I, —SO₃H, —PO⁻² ₄, —CH₃, —CH₂CH₃, —CH(CH₃)₂ or—C(CH₃)₃; where R⁵¹ is straight or branched chain alkyl, straight orbranched chain alkenyl, straight or branched chain alkynyl, aryl,heteroaryl, cycloalkyl, heterocyclyl, straight or branched chainaralkyl, straight or branched chain aralkenyl, straight or branchedchain aralkynyl, straight or branched chain heteroaralkyl, straight orbranched chain heteroaralkenyl, straight or branched chainheteroaralkynyl, straight or branched chain cycloalkylalkyl, straight orbranched chain cycloalkylalkenyl, straight or branched chaincycloalkylalkynyl, straight or branched chain heterocyclylalkyl,straight or branched chain heterocyclylalkenyl or straight or branchedchain heterocyclylalkynyl.

(c) L

In certain embodiments, the cleavable group L is cleaved either prior toor during analysis of the biomolecule, such as a protein. The analysiscan include mass spectral analysis, for example MALDI-TOF mass spectralanalysis. The cleavable group L is selected so that the group is stableduring conjugation to a biomolecule, and sorting, such as hybridizationof a single stranded oligonucleotide Q moiety to a complementarysequence, and washing of the hybrid; but is susceptible to cleavageunder conditions of analysis of the biomolecule, including, but notlimited to, mass spectral analysis, for example MALDI-TOF analysis. Incertain embodiments, the cleavable group L can be a disulfide moiety,created by reaction of the compounds where X=—SH, with the thiol sidechain of cysteine residues on the surface of biomolecules, including,but not limited to, proteins. The resulting disulfide bond can becleaved under various reducing conditions including, but not limited to,treatment with dithiothreitol and 2-mercaptoethanol.

In another embodiment, L is a photocleavable group, which can be cleavedby a short treatment with UV light of the appropriate wave length eitherprior to or during mass spectrometry. Photocleavable groups, includingthose bonds that can be cleaved during MALDI-TOF mass spectrometry bythe action of a laser beam, can be used. For example, a trityl ether oran ortho nitro substituted aralkyl, including benzyl, group aresusceptible to laser induced bond cleavage during MALDI-TOF massspectrometry. Other useful photocleavable groups include, but are notlimited to, o-nitrobenzyl, phenacyl, and nitrophenylsulfenyl groups.

Other photocleavable groups for use herein include those disclosed inInternational Patent Application Publication No. WO 98/20166. In oneembodiment, the photocleavable groups have formula I:

where R²⁰ is ω-O-alkylene-; R²¹ is selected from hydrogen, alkyl, aryl,alkoxycarbonyl, aryloxycarbonyl and carboxy; t is 0-3; and R⁵⁰ is alkyl,alkoxy, aryl or aryloxy. In one embodiment, Q is attached to R²⁰ through(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b); and the biomolecule of interest iscaptured onto the R²¹CH—O— moiety via a reactive derivative of theoxygen (e.g., X).

In another embodiment, the photocleavable groups have formula II:

where R²⁰ is ω-O-alkylene- or alkylene; R²¹ is selected from hydrogen,alkyl, aryl, alkoxycarbonyl, aryloxycarbonyl and carboxy; and X²⁰ ishydrogen, alkyl or OR²¹. In one embodiment, Q is attached to R²⁰ through(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b); and the biomolecule of interest iscaptured onto the R²¹CH—O— moiety via a reactive derivative of theoxygen (e.g., X).

In further embodiments, R²⁰ is —O—(CH₂)₃— or methylene; R²¹ is selectedfrom hydrogen, methyl and carboxy; and X²⁰ is hydrogen, methyl or OR²¹.In another embodiment, R²¹ is methyl; and X²⁰ is hydrogen. In certainembodiments, R²⁰ is methylene; R²¹ is methyl; and X²⁰ is3-(4,4′-dimethoxytrityloxy)propoxy.

In another embodiment, the photocleavable groups have formula III:

where R² is selected from ω-O-alkylene-O and ω-O-alkylene-, and isunsubstituted or substituted on the alkylene chain with one or morealkyl groups; c and e are each independently 0-4; and R⁷⁰ and R⁷¹ areeach independently alkyl, alkoxy, aryl or aryloxy. In certainembodiments, R² is ω-O-alkylene-, and is substituted on the alkylenechain with a methyl group. In one embodiment, Q is attached to R²through (S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b); and the biomolecule of interest iscaptured onto the Ar₂CH—O-moiety via a reactive derivative of the oxygen(e.g., X).

In further embodiments, R² is selected from 3-O—(CH₂)₃—O—, 4-O—(CH₂)₄—,3-O—(CH₂)₃—, 2-O—CH₂CH₂—, —OCH₂—,

In other embodiments, c and e are 0.

Other cleavable groups L include acid sensitive groups, where bondcleavage is promoted by formation of a cation upon exposure to mild tostrong acids. For these acid-labile groups, cleavage of the group L canbe effected either prior to or during analysis, including massspectrometric analysis, by the acidity of the matrix molecules, or byapplying a short treatment of the array with an acid, such as the vaporof trifluoroacetic acid. Exposure of a trityl group to acetic ortrifluoroacetic acid produces cleavage of the ether bond either beforeor during MALDI-TOF mass spectrometry.

The capture compound-biomolecule array can be treated by eitherchemical, including, but not limited to, cyanogen bromide, or enzymatic,including, but not limited to, in embodiments where the biomolecule is aprotein, trypsin, chymotrypsin, an exopeptidase (e.g., aminopeptidaseand carboxypeptidase) reagents to effect cleavage. For the latter, allbut one peptide fragment will remain hybridized when digestion isquantitative. Partial digestion also can be of advantage to identify andcharacterize proteins following desorption from the array. The cleavedprotein/peptide fragments are desorbed, analyzed, and characterized bytheir respective molecular weights.

In certain embodiments herein, L is selected from —S—S—,—O—P(═O)(OR⁵¹)—NH—, —O—C(═O)—,

where R¹⁵, R⁵¹ and y are as defined above. In certain embodiments, R¹⁵is —H, —OH, —OR⁵¹, —SH, —SR⁵¹, —NH₂, —NHR⁵¹, —N(R⁵¹)₂, —F, —Cl, —Br, —I,—SO₃H, —PO⁻² ₄, —CH₃, —CH₂CH₃, —CH(CH₃)₂ or —C(CH₃)₃; where R⁵¹ isstraight or branched chain alkyl, straight or branched chain alkenyl,straight or branched chain alkynyl, aryl, heteroaryl, cycloalkyl,heterocyclyl, straight or branched chain aralkyl, straight or branchedchain aralkenyl, straight or branched chain aralkynyl, straight orbranched chain heteroaralkyl, straight or branched chainheteroaralkenyl, straight or branched chain heteroaralkynyl, straight orbranched chain cycloalkylalkyl, straight or branched chaincycloalkylalkenyl, straight or branched chain cycloalkylalkynyl,straight or branched chain heterocyclylalkyl, straight or branched chainheterocyclylalkenyl or straight or branched chain heterocyclylalkynyl.

(ii) Non-Cleavable Divalent Z Moieties

In another embodiment, Z is a non-cleavable divalent moiety and has theformula:—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)—,where S¹, M, R¹⁵, S², t, a and b are as defined above.

b. Z has a Dendrimeric Structure

In another embodiment, Z has a dendritic structure (i.e., Z is amultivalent dendrimer) that is linked to a plurality of Q and Xmoieties. Z, in certain embodiments, has about 4 up to about 6, about 8,about 10, about 20, about 40, about 60 or more points of attachment(i.e., Z is tetravalent up to hexavalent, octavalent, decavalent,didecavalent, tetradecavalent, hexadecavalent, etc.). In theseembodiments, the dendritic moiety Z is based on a multivalent core M, asdefined above. The number of points of attachment on M may vary fromabout 2 up to about 4, about 6, about 8, or more. Thus, in oneembodiment, Z has the structure:

where M is as defined above, and is linked to a plurality of Q, Y, W andX moieties.

In another embodiment, Z has the structure:

where M is as defined above, and is linked to a plurality of Q, Y, W andX moieties.

In other embodiments, the dendritic Z moieties may optionally possess aplurality of spacer groups S¹ and/or S², or for embodiments where Z is acleavable linkage, a plurality of L groups. The S¹, S² and/or L moietiesare attached to the end of the dendritic chain(s).

In these embodiments, the density of the biopolymer to be analyzed, andthus signal intensity of the subsequent analysis, is increased relativeto embodiments where Z is a divalent group.

c. Z is an Insoluble Support or a Substrate

In other embodiments, Z can be an insoluble support or a substrate, suchas a particulate solid support, such as a silicon or other “bead” ormicrosphere, or solid surface so that the surface presents thefunctional groups (X, Y, Q and, as needed W). In these embodiments, Zhas bound to it one or a plurality of X moieties (typically, 1 to 100,generally 1 to 10) and optionally to at least one Q and/or Y moiety, andalso optionally to one or more W moieties. Z, in these embodiments, canhave tens up to hundreds, thousands, millions, or more functionalmoieties (groups) on its surface. For example, the capture compound canbe a silicon particle or a agarose or other particle with groupspresented on it. As discussed below, it further can be coated with ahydrophobic material, such as lipid bilayers or other lipids that areused, for example to produce liposomes. In such embodiments, theresulting particles with a hydrophobic surface and optional hydrophobicW groups are used in methods for probing cell membrane environments andother intracellular environments. Gentle lysis of cells, can expose theintracellular compartments and organelles, and hydrophobic capturecompounds, such as these, can be reacted with them, and the boundbiomolecules assessed by, for example, mass spectrometry or furthertreated to release the contents of the compartments and organelles andreacted with the capture compounds or other capture compounds.

In embodiments in which Z is an insoluble support, the insoluble supportor substrate moiety Z can be based on a flat surface constructed, forexample, of glass, silicon, metal, plastic or a composite or othersuitable surface; or can be in the form of a “bead” or particle, such asa silica gel, a controlled pore glass, a magnetic or cellulose bead; orcan be a pin, including an array of pins suitable for combinatorialsynthesis or analysis. Substrates can be fabricated from virtually anyinsoluble or solid material. For example, silica gel, glass (e.g.,controlled-pore glass (CPG)), nylon, Wang resin, Merrifield resin,dextran cross-linked with epichlorohydrin (e.g., Sephadex®), agarose(e.g., Sepharose®), cellulose, magnetic beads, Dynabeads®, a metalsurface (e.g., steel, gold, silver, aluminum, silicon and copper), aplastic material (e.g., polyethylene, polypropylene, polyamide,polyester, polyvinylidene-difluoride (PVDF)) Exemplary substrateinclude, but are not limited to, beads (e.g., silica gel, controlledpore glass, magnetic, dextran cross-linked with epichlorohydrin (e.g.,Sephadex®), agarose (e.g., Sepharose®), cellulose, capillaries, flatsupports such as glass fiber filters, glass surfaces, metal surfaces(steel, gold, silver, aluminum, copper and silicon), plastic materialsincluding multiwell plates or membranes (e.g., of polyethylene,polypropylene, polyamide, polyvinylidenedifluoride), pins (e.g., arraysof pins suitable for combinatorial synthesis or analysis) or beads inpits of flat surfaces such as wafers (e.g., silicon wafers) with orwithout plates. The solid support is in any desired form, including, butnot limited to, a bead, capillary, plate, membrane, wafer, comb, pin, awafer with pits, an array of pits or nanoliter wells and othergeometries and forms known to those of skill in the art. Supportsinclude flat surfaces designed to receive or link samples at discreteloci.

In one embodiment, the solid supports or substrates Z are “beads” (i.e.,particles, typically in the range of less than 200 μm or less than 50 μmin their largest dimension) including, but not limited to, polymeric,magnetic, colored, R_(f)-tagged, and other such beads. The beads can bemade from hydrophobic materials, including, but not limited to,polystyrene, polyethylene, polypropylene or teflon, or hydrophilicmaterials, including, but not limited to, cellulose, dextrancross-linked with epichlorohydrin (e.g., Sephadex®), agarose (e.g.,Sepharose®), polyacrylamide, silica gel and controlled pore glass beadsor particles. These types of capture compounds can be reacted in liquidphase in suspension, and the spun down or other removed from thereaction medium, and the resulting complexes analyzed, such as by massspectrometry. They can be sorted using the Q function to bind todistinct loci on a solid support, or they can include a label to permitaddressing, such as an radio frequency tag or a colored label or barcode or other symbology imprinted thereon. These can be sorted accordingto the label, which serves as “Q” function, and then analyzed by massspectrometry.

In further embodiments, the insoluble support or substrate Z moietiesoptionally can possess spacer groups S¹ and/or S², or for embodimentswhere Z is a cleavable linkage, L. The S¹, S² and/or L moieties areattached to the surface of the insoluble support or substrate.

In these embodiments, the density of the biomolecule to be analyzed, andthus signal intensity of the subsequent analysis, is increased relativeto embodiments where Z is a divalent group. In certain embodiments, anappropriate array of single stranded oligonucleotides or oligonucleotideanalogs that are complementary to the single stranded oligonucleotide oroligonucleotide analog sorting functions Q will be employed in themethods provided herein.

d. Mass Modified Z Moieties

In other embodiments, including embodiments where Z is a cleavablemoiety, Z includes a mass modifying tag. In certain embodiments, themass modifying tag is attached to the cleavable linker L. In oneembodiment, the mass modified Z moiety has the formula:—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)-L-T-,where S¹, t, M, R¹⁵, a, S², b and L are selected as above; and T is amass modifying tag. Mass modifying tags for use herein include, but arenot limited to, groups of formula —X¹R¹⁰—, where X¹ is a divalent groupsuch as —O—, —O—C(O)—(CH₂)_(y)—C(O)O—, —NH—C(O)—, —C(O)—NH—,—NH—C(O)—(CH₂)_(y)—C(O)O—, —NH—C(S)—NH—, —O—P(O-alkyl)-O—, —O—SO₂—O—,—O—C(O)—CH₂—S—, —S—, —NH— and

and R¹⁰ is a divalent group including —(CH₂CH₂O)_(z)—CH₂CH₂O—,—(CH₂CH₂O)_(z)—CH₂CH₂O-alkylene, alkylene, alkenylene, alkynylene,arylene, heteroarylene, —(CH₂)_(z)—CH₂—O—, —(CH₂)_(z)—CH₂—O-alkylene,—(CH₂CH₂NH)_(z)—CH₂CH₂NH—, —CH₂—CH(OH)—CH₂O—, —Si(R¹²)(R¹³)—, —CHF— and—CF₂—; where y is an integer from 1 to 20; z is an integer from 0 to200; R¹¹ is the side chain of an α-amino acid; and R¹² and R¹² are eachindependently selected from alkyl, aryl and aralkyl.

In other embodiments, —X¹R¹⁰— is selected from —S—S—, —S—,—(NH—(CH₂)_(y)—NH—C(O)—(CH₂)_(y)—C(O))_(z)—NH—(CH₂)_(y)—NH—C(O)—(CH₂)_(y)—C(O)O—,—(NH—(CH₂)_(y)—C(O))_(z)—NH—(CH₂)_(y)—C(O)O—,—(NH—CH(R¹¹)—C(O))_(z)—NH—CH(R¹¹)—C(O)O—, and—(O—(CH₂)_(y)—C(O))_(z)—NH—(CH₂)_(y)—C(O)O—.

In the above embodiments, where R¹⁰ is an oligo-/polyethylene glycolderivative, the mass-modifying increment is 44, i.e., five differentmass-modified species can be generated by changing z from 0 to 4, thusadding mass units of 45 (z=0), 89 (z=1), 133 (z=2), 177 (z=3) and 221(z=4) to the compounds. The oligo/polyethylene glycols also can bemonoalkylated by a lower alkyl such as methyl, ethyl, propyl, isopropyl,t-butyl and the like.

Other mass modifying tags include, but are not limited to —CHF—, —CF₂—,—Si(CH₃)₂—, —Si(CH₃)(C₂H₅)— and —Si(C₂H₅)₂. In other embodiments, themass modifying tags include homo- or heteropeptides. A non-limitingexample that generates mass-modified species with a mass increment of 57is an oligoglycine, which produce mass modifications of, e.g., 74 (y=1,z=O), 131 (y=1, z=2), 188 (y=1, z=3) or 245 (y=1, z=4). Oligoamides alsocan be used, e.g., mass-modifications of 74 (y=1, z=0), 88 (y=2, z=0),102 (y=3, z=0), 116 (y=4, z=0), etc., are obtainable. Those skilled inthe art will appreciate that there are numerous possibilities inaddition to those exemplified herein for introducing, in a predeterminedmanner, many different mass modifying tags to the compounds providedherein.

In other embodiments, R¹⁵ and/or S² can be functionalized with —X¹R¹⁰Hor —X¹R¹⁰-alkyl, where X¹ and R¹⁰ are defined as above, to serve as massmodifying tags.

2. Reactivity Functions “X”

Reactivity functions (“X”) confer the ability on the compounds to bindeither covalently or with a high affinity (greater than 10⁹, generallygreater than 10¹⁰ or 10¹¹ liters/mole, typically greater than amonoclonal antibody, and typically stable to mass spectrometricanalysis, such as MALDI-MS) to a biomolecule, particularly proteins,including functional groups thereon, which include post-translationallyadded groups. Generally the binding is covalent or is of such affinitythat it is stable under conditions of analysis, such as mass spectral,including MALDI-TOF, analysis. Exemplary groups are set forth herein(see, e.g., FIG. 16, and the discussion below).

In the compounds provided herein, X is a moiety that binds to orinteracts with the surface of a biomolecule, including, but not limitedto, the surface of a protein; an amino acid side chain of a protein; oran active site of an enzyme (protein) or to functional groups of otherbiomolecule, including lipids and polysaccharides.

Thus, for example, X is a group that reacts or interacts withfunctionalities on the surface of a protein to form covalent ornon-covalent bonds with high affinity. A wide selection of differentfunctional groups are available for X to interact with a protein. Forexample, X can act either as a nucleophile or an electrophile to formcovalent bonds upon reaction with the amino acid residues on the surfaceof a protein. Exemplary reagents that bind covalently to amino acid sidechains include, but are not limited to, protecting groups for hydroxyl,carboxyl, amino, amide, and thiol moieties, including, for example,those disclosed in T. W. Greene and P. G. M. Wuts, “Protective Groups inOrganic Synthesis,” 3rd ed. (1999, Wiley Interscience); photoreactivegroups, Diels Alder couples (i.e., a diene on one side and a singledouble bond on the other side).

Hydroxyl protecting groups for use as X groups herein include, but arenot limited to:

(i) ethers such as methyl, substituted methyl (methoxymethyl,methylthiomethyl, (phenyldimethylsilyl)methoxymethyl, benzyloxymethyl,p-methoxybenzyloxymethyl, p-nitrobenzyloxymethyl,o-nitrobenzyloxymethyl, (4-methoxyphenoxy)methyl, guaiacolmethyl,t-butoxymethyl, 4-pentenyloxymethyl, siloxymethyl,2-methoxyethoxymethyl, 2,2,2,-trichloroethoxymethyl,bis(2-chloroethoxymethyl), 2-(trimethylsilyl)ethoxymethyl,menthoxymethyl, tetrahydropyranyl, 3-bromotetrahydropyranyl,tetrahydrothiopyranyl, 1-methoxycyclohexyl, 4-methoxytetrahydropyranyl,4-methoxytetrahydrothiopyranyl, 4-methoxytetrahydrothiopyranylS,S-dioxide, 1-[(2-chloro-4-methyl)phenyl]-4-methoxypiperidin-4-yl,1-(2-fluorophenyl)-4-methoxypiperidin-4-yl, 1,4-dioxan-2-yl,tetrahydrofuranyl, tetrahydrothiofuranyl,2,3,3a,4,5,6,7,7a-octahydro-7,8,8-trimethyl-4,7-methanobenzofuran-2-yl),substituted ethyl (1-ethoxyethyl, 1-(2-chloroethoxy)ethyl,1-[2-(trimethylsilyl)ethoxy]ethyl, 1-methyl-1-methoxyethyl,1-methyl-1-benzyloxyethyl, 1-methyl-1-benzyloxy-2-fluoroethyl,1-methyl-1-phenoxyethyl, 2,2,2-trichloroethyl,1,1-dianisyl-2,2,2-trichloroethyl,1,1,1,3,3,3-hexafluoro-2-phenylisopropyl, 2-trimethylsilylethyl,2-(benzylthio)ethyl, 2-(phenylselenyl)ethyl), t-butyl, allyl, propargyl,p-chlorophenyl, p-methoxyphenyl, p-nitrophenyl, 2,4-dinitrophenyl,2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenyl, benzyl, substitutedbenzyl (p-methoxybenzyl, 3,4,-dimethoxybenzyl, o-nitrobenzyl,p-nitrobenzyl, p-halobenzyl, 2,6-dichlorobenzyl, p-phenylbenzyl,p-phenylenzyl, 2,6-difluorobenzyl, p-acylaminobenzyl, p-azidobenzyl,4-azido-3-chlorobenzyl, 2-trifluoromethylbenzyl,p-(methylsulfinyl)benzyl), 2- and 4-picolyl, 3-methyl-2-picolyl N-oxido,2-quinolinylmethyl, 1-pyrenylmethyl, diphenylmethyl,p,p′-dinitrobenzhydryl, 5-dibenzosuberyl, triphenylmethyl,α-naphthyldiphenylmethyl, p-methoxyphenyldiphenylmethyl,di(p-methoxyphenyl)phenylmethyl, tri(p-methoxyphenyl)methyl,4-(4-′-bromophenacyloxy)phenyldiphenylmethyl,4,4′,4″-tris(4,5-dichlorophthalimidophenyl)methyl,4,4′,4″-tris(levulinoyloxyphenyl)methyl,4,4′,4″-tris(benzoyloxyphenyl)methyl,4,4′-dimethoxy-3″-[N-(imidazolylmethyl)]trityl,4,4′-dimethoxy-3″-[N-(imidazolylethyl)carbamoyl]trityl,1,1-bis(4-methoxyphenyl-1′-pyrenylmethyl,4-(17-tetrabenzo[a,c,g.i]fluorenylmethyl)-4,4″-dimethoxytrityl,9-Anthryl, 9-(9-phenyl)xanthenyl, 9-(9-phenyl-10-oxo)anthryl,1,3-benzodithiolan-2-yl, benzisothiazolyl s,s-dioxido, silyl ethers(trimethylsilyl, triethylsilyl, triisopropylsilyl,dimethylisopropylsilyl, diethylisopropylsilyl, dimethylthexylsilyl,t-butyldimethylsilyl, t-butyldiphenylsilyl, tribenzylsilyl,tri-p-xylylsilyl, triphenylsilyl, diphenylmethylsilyl,di-t-butylmethylsilyl, tris(trimethylsilyl)silyl (silyl),(2-hydroxystyryl)dimethylsilyl, (2-hydroxystyryl)diisopropylsilyl,t-butylmethoxyphenylsilyl, t-butoxydiphenylsilyl);

(ii) esters such as formate, benzoylformate, acetate, substitutedacetate (chloroacetate, dichloroacetate, trichloroacetate,trifluoroacetate, methoxyacetate, triphenylmethoxyacetate,phenoxyacetate, p-chlorophenoxyacetate, phenylacetate,p-P-phenylacetate, diphenylacetate), nicotinate, 3-phenylpropionate,4-pentenoate, 4-oxopentanoate (levulinate),4,4-(ethylenedithio)pentanoate,5-[3-bis(4-methoxyphenyl)hydroxymethylphenoxy]levulinate, pivaloate,1-adamantoate, crotonate, 4-methoxycrotonate, benzoate,p-phenylbenzoate, 2,4,6-trimethylbenzoate (mesitoate), carbonates(methyl, methoxymethyl, 9-fluorenylmethyl, ethyl, 2,2,2-trichloroethyl,1,1,-dimethyl-2,2,2-trichloroethyl, 2-(trimethylsilyl)ethyl,2-(phenylsulfonyl)ethyl, 2-(triphenylphosphonio)ethyl, isobutyl, vinyl,allyl, p-nitrophenyl, benzyl, p-methoxybenzyl, 3,4,-dimethoxybenzyl,o-nitrobenzyl, p-nitrobenzyl, 2-dansylethyl, 2-(4-nitrophenyl)ethyl,2-(2,4-dinitrophenyl)ethyl, 2-cyano-1-phenylethyl, S-benzylthiocarbonate, 4-ethoxy-1-naphthyl, methyl dithiocarbonate),2-iodobenzoate, 4-azidobutyrate, 4-nitro-4-methylpentanoate,o-(dibromomethyl)benzoate, 2-formylbenzenesulfonate,2-(methylthiomethoxy)ethyl carbonate, 4-(methylthiomethoxy)butyrate,2-(methylthiomethoxymethyl)benzoate, 2-(chloroacetoxymethyl)benzoate,2-[(2-chloroacetoxy)ethyl]benzoate, 2-[2-(benzyloxy)ethyl]benzoate,2-[2-(4-methoxybenzyloxy)ethyl]benzoate,2,6-dichloro-4-methylphenoxyacetate,2,6-dichloro-4-(1,1,3,3-tetramethylbutyl)phenoxyacetate,2,4-bis(1,1-dimethylpropyl)phenoxyacetate, chlorodiphenylacetate,isobutyrate, monosuccionoate, (E)-2-methyl-2-butenoate (tigloate),o-(methoxycarbonyl)benzoate, p-P-benzoate, α-naphthoate, nitrate, alkylN,N,N′,N′-tetramethylphosphorodiamidate, 2-chlorobenzoate,4-bromobenzoate, 4-nitrobenzoate, 3′5′-dimethoxybenzoin, a wild andwoolly photolabile fluorescent ester, N-phenylcarbamate, borate,dimethylphosphinothioyl, 2,4-dinitrophenylsulfenate; and

(iii) sulfonates (sulfate, allylsulfonate, methanesulfonate (mesylate),benzylsulfonate, tosylate, 2-[(4-nitrophenyl)ethyl]sulfonate).

Carboxyl protecting groups for use as X groups herein include, but arenot limited to:

(i) esters such as enzymatically cleavable esters (heptyl,2-N-(morpholino)ethyl, choline, (methoxyethoxy)ethyl, methoxyethyl),methyl, substituted methyl (9-fluorenylmethyl, methoxymethyl,methylthiomethyl, tetrahydropyranyl, tetrahydrofuranyl,methoxyethoxymethyl, 2-(trimethylsilyl)ethoxymethyl, benzyloxymethyl,pivaloyloxymethyl, phenylacetoxymethyl, triisopropylsilylmethyl,cyanomethyl, acetol, phenacyl, p-bromophenacyl, α-methylphenacyl,p-methoxyphenacyl, desyl, carboxamidomethyl,p-azobenzenecarboxamidomethyl, N-phthalimidomethyl), 2-substituted ethyl(2,2,2-trichloroethyl, 2-haloethyl, ω-chloroalkyl,2-(trimethylsilyl)ethyl, 2-methylthioethyl, 1,3-dithianyl-2-methyl,2-(p-nitrophenylsulfenyl)ethyl, 2-(p-toluenesulfonyl)ethyl,2-(2′-pyridyl)ethyl, 2-(p-methoxyphenyl)ethyl,2-(diphenylphosphino)ethyl, 1-methyl-1-phenylethyl,2-(4-acetyl-2-nitrophenyl)ethyl, 2-cyanoethyl), t-butyl,3-methyl-3-pentyl, dicyclopropylmethyl, 2,4-dimethyl-3-pentyl,dicyclopropylmethyl, cyclopentyl, cyclohexyl, allyl, methallyl,2-methylbut-3-en-2-yl, 3-methylbut-2-(prenyl), 3-buten-1-yl,4-(trimethylsilyl)-2-buten-1-yl, cinnamyl, α-methylcinnamyl, prop-2-ynyl(propargyl), phenyl, 2,6-dialkylphenyl (2,6,-dimethylphenyl,2,6,diisopropylphenyl, 2,6-di-t-butyl-4-methylphenyl,2,6-di-t-butyl-4-methoxyphenyl, p-(methylthio)phenyl, pentafluorophenyl,benzyl, substituted benzyl (triphenylmethyl, diphenylmethyl,bis(o-nitrophenyl)methyl, 9-anthrylmethyl, 2-(9,10-dioxo)anthrylmethyl,5-dibenzosuberyl, 1-pyrenylmethyl,2-(trifluoromethyl)-6-chromonylmethyl, 2,4,6-trimethylbenzyl,p-bromobenzyl, o-nitrobenzyl, p-nitrobenzyl, p-methoxybenzyl,2,6-dimethoxybenzyl, 4-(methylsulfinyl)benzyl, 4-sulfobenzyl,4-azidomethoxybenzyl,4-{N-[1-(4,4,-dimethyl-2,6-dioxocychlohexylidene)-3-methylbutyl]amino}benzyl,piperonyl, 4-picolyl, p-P-benzyl), silyl (trimethylsilyl, triethylsilyl,t-butyldimethylsilyl, i-propyldimethylsilyl, phenyldimethylsilyl,di-t-butylmethylsilyl, triisopropylsilyl), activated (thiol), oxazoles,2-alkyl-1,3-oxazoline, 4-alkyl-5-oxo-1,3-oxazolidine,2,2,-bistrifluoromethyl-4-alkyl-5-oxo-1-,3-oxazolidine,5-alkyl-4-oxo-1,3-dioxolane, dioxanones, ortho esters, Braun orthoester, pentaminocobalt(iii) complex, stannyl (triethylstannyl,tri-N-butylstannyl);

(ii) amides (N,N-dimethyl, pyrrolidinyl, piperidinyl,5,6-dihydrophenanthridinyl, o-nitroanilide, N-7-nitroindolyl,N-8-nitro-1,2,3,4-tetrahydroquinolyl, 2-(2-aminophenyl)acetaldehydedimethyl acetal amide, p-P-benzenesulfonamide;

(iii) hydrazides (N-phenyl, N,N′-diisopropyl); and

(iv) tetraalkylammonium salts.

Thiol protecting groups for use as X groups herein include, but are notlimited to:

(i) thioethers (S-alkyl, S-benzyl, S-p-methoxybenzyl, S-o- or p-hydroxy-or acetoxybenzyl, S-p-nitrobenzyl, S-2,4,6-trimethylbenzyl,S-2,4,6-trimethoxybenzyl, S-4-picolyl, S-2-quinolinylmethyl, S-2-picolylN-oxido, S-9-anthrylmethyl, S-9-fluorenylmethyl, S-xanthenyl,S-ferrocenylmethyl); S-diphenylmethyl, substituted S-diphenylmethyl andS-triphenylmethyl (S-diphenylmethyl, S-bis(4-methoxyphenyl)methyl,S-5-dibenzosuberyl, S-triphenylmethyl, S-diphenyl-4-pyridylmethyl),S-phenyl, S-2,4-dinitrophenyl, S-t-butyl, S-1-adamantyl, substitutedS-methyl including monothio, dithio and aminothioacetals(S-methoxymethyl, S-isobutoxymethyl, S-benzyloxymethyl,S-2-tetrahydropyranyl, S-benzylthiomethyl, S-phenylthiomethyl,thiazolidine, S-acetamidomethyl, S-trimethylacetomidomethyl,S-benzamidomethyl, S-allyloxycarbonylaminomethyl,S-phenylacetamidomethyl, S-phthalimidomethyl, S-acetyl-, S-carboxyl-,and S-cyanomethyl), substituted S-ethyl (S-(2-nitro-1-phenyl)ethyl,S-2-(2,4-dintrophenyl)ethyl, S-2-(4′-pyridyl)ethyl, S-2-cyanoethyl,S-2-(trimethylsilyl)ethyl, S-(1-m-nitrophenyl-2-benzoyl)ethyl,S-2-phenylsulfonylethyl, S-1-(4-methylphenylsulfonyl)-2-methylprop-2-yl,silyl;

(ii) thioesters (S-acetyl, S-benzoyl, S-trifluoroacetyl,S—N—[[(p-biphenyl)isopropoxy]carbonyl]-N-methyl-γ-aminothiobutyrate,S—N-(t-butoxycarbonyl-N-methyl-γ-aminothiobutyrate), thiocarbonates(S-2,2,2-trichloroethoxycarbonyl, S-t-butoxycarbonyl,S-benzyloxycarbonyl, S-p-methoxybenzyloxycarbonyl), thiocarbamates(S—(N-ethyl), S—(N-methoxymethyl));

(iii) unsymmetrical disulfides (S-ethyl, S-t-butyl, substituted S-phenyldisulfides);

(iv) sulfenyl derivatives (S-sulfonate, S-sulfenylthiocarbonate,S-3-nitro-2-pyridinesulfenyl sulfide,S-[tricarbonyl[1,2,3,4,5-η]-2-,4-cyclohexadien-1-yl]-iron(1+),oxathiolone); and

(v) S-methylsulfonium salt, S-benzyl- and S-4-methoxybenzylsulfoniumsalt, S-1-(4-phthalimidobutyl)sulfonium salt,S-(dimethylphosphinol)thioyl, S-(diphenylphosphino)thioyl.

Amino protecting groups for use as X groups herein include, but are notlimited to:

(i) carbamates (methyl, ethyl, 9-fluorenylmethyl,942-sulfo)fluorenylmethyl, 9-(2,7-dibromo)fluorenylmethyl,17-tetrabenzo[a,c,g.i]fluorenylmethyl, 2-Chloro-3-indenylmethyl,benz[f]inden-3-ylmethyl,2,7-di-t-butyl-[9-(10,10-dioxo-10,10,10,10-tetrahydrothiox,1,1-dioxobenzo[b]thiophene-2-ylmethyl, substituted ethyl(2,2,2-trichloroethyl, 2-trimethylsilylethyl, 2-phenylethyl,1-(1-adamantyl)-1-methylethyl, 2-chloroethyl, 1,1-dimethyl-2-haloethyl,1,1-dimethyl-2,2-dibromoethyl, 1,1-dimethyl-2,2,2-trichloroethyl,1-methyl-1-(4-biphenyl)ethyl, 1-(3,5-di-t-butylphenyl)-1-methylethyl,2-(2′- and 4′-pyridyl)ethyl, 2,2-bis(4′-nitrophenyl)ethyl,N-(2-pivaloylamino)-1,1-dimethylethyl,2-[(2-nitrophenyl)dithio]-1-phenylethyl,2-(N,N-dicyclohexylcarboxamido)ethyl), t-butyl, 1-adamantyl,2-adamantyl, vinyl, allyl, 1-isopropylallyl, cinnamyl, 4-nitrocinnamyl,3-(3′pyridyl)prop-2-enyl, 8-quinolyl, N-hydroxypiperidinyl, alkyldithio,benzyl, p-methoxybenzyl, p-nitrobenzyl, p-bromobenzyl, p-chlorobenzyl,2,4-dichlorobenzyl, 4-methylsulfinylbenzyl, 9-anthrylmethyl,diphenylmethyl, 2-methylthioethyl, 2-methylsulfonylethyl,2-(p-toluenesulfonyl)ethyl, [2-(1,3-dithianyl)methyl,4-methylthiophenyl, 2,4-dimethylthiophenyl, 2-phosphonioethyl,1-methyl-1-(triphenylphsophonio)ethyl, 1,1-dimethyl-2-cyanoethyl,2-dansylethyl, 2-(4-nitrophenyl)ethyl, 4-phenylacetoxybenzyl,4-azidobenzyl, 4-azidomethoxybenzyl, m-chloro-p-acyloxybenzyl,p-(dihydroxyboryl)benzyl, 5-benzisoxazolylmethyl,2-(trifluoromethyl)-6-chromonylmethyl, m-nitrophenyl,3,5-dimethoxybenzyl, 1-methyl-1-(3,5-dimethoxyphenyl)ethyl,α-methylnitropiperonyl, o-nitrobenzyl, 3,4-dimethoxy-6-nitrobenzyl,phenyl(o-nitrophenyl)methyl, 2-(2-nitrophenyl)ethyl, 6-nitroveratryl,4-methoxyphenacyl, 3′,5′-dimethoxybenzoin, ureas(phenothiazinyl-(10)-carbonyl derivative,N′-p-toluenesulfonylaminocarbonyl, N′-phenylaminothiocarbonyl), t-amyl,S-benzyl thiocarbamate, butynyl, p-cyanobenzyl, cyclobutyl, cyclohexyl,cyclopentyl, cyclopropylmethyl, p-decyloxybenzyl, diisopropylmethyl,2,2-dimethoxycarbonylvinyl, o-(N′—N′-dimethylcarboxamido)benzyl,1,1-dimethyl-3-(N′,N′-dimethylcarboxamido)propyl, 1,1-dimethylpropynyl,di(2-pyridyl)methyl), 2-furanylmethyl, 2-lodoethyl, isobornyl, isobutyl,isonicotinyl, p-(p′-methoxyphenylazo)benzyl, 1-methylcyclobutyl,1-methylcyclohexyl, 1-methyl-1-cyclopropylmethyl,1-methyl-1-(p-phenylazophenyl)ethyl, 1-methyl-1-phenylethyl,1-methyl-1-(4′-pyridyl)ethyl, phenyl, p-(phenylazo)benzyl,2,4,6-tri-t-butylphenyl, 4-(trimethylammonium)benzyl,2,4,6-trimethylbenzyl);

(ii) amides (N-formyl, N-acetyl, N-chloroacetyl, N-tricholoroacetyl,N-trifluoroacetyl, N-phenylacetyl, N-3-phenylpropionyl, N-4-pentenoyl,N-picolinoyl, n-3-pyridylcarboxamido, N-benzoylphenylalanyl derivative,N-benzoyl, N-p-phenylbenzoyl, N-o-nitrophenylacetyl,N-o-nitrophenoxyacetyl, N-3-(o-nitrophenyl)propionyl,N-2-methyl-2-(o-nitrophenoxy)propionyl, N-3-methyl-3-nitrobutyryl,N-o-nitrocinnamoyl, N-o-nitrobenzoyl,N-3-(4-t-butyl-2,6-dinitrophenyl-2,2-dimethylpropionyl,N-o-(benzoyloxymethyl)benzoyl, N-(2-acetoxymethyl)benzoyl,N-2-[(t-butyldiphenylsiloxy)methyl]benzoyl,N-3-(3′,6′-dioxo-2′,4′,5′-trimethylcyclohexa-1′,4′-diene)-3,3-dimethylpropionyl,N-o-hydroxy-trans-cinnamoyl, N-2-methyl-2-(o-phenylazophenoxy)propionyl,N-4-chlorobutyryl, N-acetoacetyl, N-3-(p-hydroxyphenyl)propionyl,(N′-dithiobenzyloxycarbonylamino)acetyl, N-acetylmethionine derivative,4,5-diphenyl-3-oxazolin-2-one), cyclic imides (N-phthaloyl,N-tetrachlorophthaloyl, N-4-nitrophthaloyl, N-dithiasuccinoyl,N-2,3-diphenylmaleoyl, N-2,5-dimethylpyrrolyl,N-2,5-bis(triisopropylsiloxy)pyrrolyl,N-1,1,4,4-tetramethyldisilylazacyclopentane adduct,N-1,1,3,3-tetramethyl-1,3-disilaisoindolyl, 5-substituted1,3-dimethyl-1,3,5-triazacyclohexan-2-one, 5-substituted1,3-dibenzyl-1,3,5-triazacyclohexan-2-one, 1-substituted3,5-dinitro-4-pyridonyl, 1,3,5-dioxazinyl);

(iii) N-alkyl and N-aryl amines (N-methyl, N-t-butyl, N-allyl,N42-(trimethylsilyl)ethoxy)methyl, N-3-acetoxypropyl, N-cyanomethyl,N-(1-isopropyl-4-nitro-2-oxo-3-pyrrolin-3-yl), N-2,4-dimethoxybenzyl,N-2-azanorbornenyl, N-2,4-dinitrophenyl, quaternary ammonium salts,N-benzyl, N-4-methoxybenzyl, N-2,4-dimethoxybenzyl, N-2-hydroxybenzyl,N-diphenylmethyl, N-bis(4-methoxyphenyl)methyl, N-5-dibenzosuberyl,N-triphenylmethyl, N-(4-methoxyphenyl)diphenylmethyl,N-9-phenylfluorenyl, N-ferrocenylmethyl, N-2-picolylamine N′-oxide);

(iv) imines (N-1,1-dimethylthiomethylene, N-benzylidine,N-p-methoxybenzylidene, N-diphenylmethylene,N-[(2-pyridyl)mesityl]methylene, N—(N′,N′-dimethylaminomethylene),N—(N′,N′-dibenzylaminomethylene), N—(N′-t-butylaminomethylene),N,N′-isopropylidene, N-p-nitrobenzylidene, N-salicylidene,N-5-chlorosalicylidene, N-(5-chloro-2-hydroxyphenyl)phenylmethylene,N-cyclohexylidene, N-t-butylidene);

(v) enamines (N-(5,5-dimethyl-3-oxo-1-cyclohexenyl,N-2,7-dichloro-9-fluorenylmethylene,n-2-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl,N-4,4,4-trifluoro-3-oxo-1-buteryl,N-1-isopropyl-4-nitro-2-oxo-3-pyrrolin-3-yl);

(vi) N-heteroatom derivatives (N-borane derivatives, N-diphenylborinicacid derivative, N-diethylborinic acid derivative, N-difluoroborinicacid derivative, N,N′-3,5-bis(trifluoromethyl)phenylboronic acidderivative, N-[phenyl(pentacarbonylchromium- or -tungsten)]carbenzyl,N-copper or N-zinc chelate, 18-crown-6 derivative, N-nitro, N-nitroso,N-oxide, triazene derivative, N-diphenylphosphinyl, N-dimethyl- anddiphenylthiophosphinyl, N-dialkyl phosphoryl, N-dibenzyl and diphenylphosphoryl, iminotriphenylphosphorane derivative, N-benzenesulfenyl,N-o-nitrobenzenesulfenyl, N-2,4-dinitrobenzenesulfenyl,N-pentachlorobenzenesulfenyl, N-2-nitro-4-methoxybenzensulfenyl,N-triphenylmethysulfenyl,N-1-(2,2,2-trifluoro-1,1-diphenyl)ethylsulfenyl,N-3-nitro-2-pyridinesulfenyl, N-p-toluenesulfonyl, N-benzenesulfonyl,N-2,3-6-trimethyl-4-methoxybenzenesulfonyl,N-2,4,6-trimethoxybenzesulfonyl,N-2,6-dimethyl-4-methoxybenzenesulfonyl, N-pentamethylbenzenelsulfonyl,N-2,3,5,6-tetramethyl-4-methoxybenzenesulfonyl,N-4-methoxybenzenesulfonyl, N-2,4,6-trimethylbenzenesulfonyl,N-2,6-dimethoxy-4-methylbenzenesulfonyl,N-3-methoxy-4-t-butylbenzenesulfonyl,N-2,2,5,7,8-pentamethylchroman-6-sulfonyl, N-2- and4-nitrobenzenesulfonyl, N-2,4-dinitrobenzenesulfonyl,N-benzothiazole-2-sulfonyl, N-pyridine-2-sulfonyl, N-methanesulfonyl,N-2-(trimethylsilyl)ethanesulfonyl, N-9-anthracenesulfonyl,N-4-(4′,8′-dimethoxynaphthylmethyl)benzenesulfonyl, N-benzylsulfonyl,N-trifluoromethylsulfonyl, N-phenacylsulfonyl, N-t-butylsulfonyl);

(vii) imidazole protecting groups including N-sulfonyl derivatives(N,N-dimethylsulfonyl, N-mesitylenesulfonyl, N-p-methoxyphenylsulfonyl,N-benzenesulfonyl, N-p-toluenesulfonyl); carbamates(2,2,2-trichloroethyl, 2-(trimethylsilyl)ethyl, t-butyl,2,4-dimethylpent-3-yl, cyclohexyl, 1,1-dimethyl-2,2,2-trichloroethyl,1-adamantyl, 2-adamantyl); N-alkyl and N-aryl derivatives (N-vinyl,N-2-chloroethyl, N-(1-ethoxy)ethyl, N-2-(2′-pyridyl)ethyl,N-2-(4′-pyridyl)ethyl, N-2-(4′-nitrophenyl)ethyl), N-trialkyl silylderivatives (N-t-butyldimethylsilyl, N-triisopropylsilyl), N-allyl,N-benzyl, N-p-methoxybenzyl, N-3,4-dimethoxybenzyl, N-3-methoxybenzyl,N-3,5-dimethoxybenzyl, N-2-nitrobenzyl, N-4-nitrobenzyl,N-2,4-dinitrophenyl, N-phenacyl, N-triphenylmethyl, N-diphenylmethyl,N-(diphenyl-4-pyridylmethyl), N-(n′,n′-dimethylamino)), amino acetalderivatives (N-hydroxymethyl, N-methoxymethyl, N-diethoxymethyl,N-ethoxymethyl, N-(2-chloroethoxy)methyl,N-[2-(trimethylsilyl)ethoxy]methyl, N-t-butoxymethyl,N-t-butyldimethylsiloxymethyl, N-pivaloyloxymethyl, N-benzyloxymethyl,N-dimethylaminomethyl, N-2-tetrahydropyranyl), amides (carbon dioxideadduct, N-formyl, N-(n′,n′-diethylureidyl), N-dichloroacetyl,N-pivaloyl, N-diphenylthiophosphinyl); and

(viii) amide —NH protecting groups including amides (N-allyl, N-t-butyl,N-dicyclopropylmethyl, N-methoxymethyl, N-methylthiomethyl,N-benzyloxymethyl, N-2,2,2-trichloroethoxymethyl,N-t-butyldimethylsiloxymethyl, N-pivaloyloxymethyl, N-cyanomethyl,N-pyrrolidinomethyl, N-methoxy, N-benzyloxy, N-methylthio,N-triphenylmethylthio, N-t-butyldimethylsilyl, N-triisopropylsilyl,N-4-methoxyphenyl, N-3,4-dimethoxyphenyl, N-4-(methoxymethoxy)phenyl,N-2-methoxy-1-naphthyl, N-benzyl, N-4-methoxybenzyl,N-2,4-dimethoxybenzyl, N-3,4-dimethoxybenzyl, N-o-nitrobenzyl,N-bis(4-methoxyphenyl)methyl, N-bis(4-methoxyphenyl)phenylmethyl,N-bis(4-methylsulfinylphenyl)methyl, N-triphenylmethyl,N-9-phenylfluorenyl, N-bis(trimethylsilyl)methyl, N-t-butoxycarbonyl,N-benzyloxycarbonyl, N-methoxycarbonyl, N-ethoxycarbonyl,N-p-toluenesulfonyl, N,O-isopropylidene ketal, N,O-benzylidene acetal,N,O-formylidene acetal, N-butenyl, N-ethenyl,N-[(e)-(2-methoxycarbonyl)vinyl], N-diethoxymethyl,N-(1-methoxy-2,2-dimethylpropyl), N-2-(4-methylphenylsulfonyl)ethyl).

These protecting groups react with amino acid side chains such ashydroxyl (serine, threonine, tyrosine); amino (lysine, arginine,histidine, proline); amide (glutamine, asparagine); carboxylic acid(aspartic acid, glutamic acid); and sulfur derivatives (cysteine,methionine), and are readily adaptable for use in the capture compoundsas the reactive moiety X.

It is in addition to the wide range of group-specific reagents that areknown to persons of skill in the art, reagents that are known in naturalproduct chemistry also can serve as a basis for X in forming covalentlinkages. Other choices for, X include protein purification dyes, suchas acridine or methylene blue, which have a strong affinity for certainproteins.

Alternatively, X can act as an electron donor or an electron acceptor toform non-covalent bonds or a complex, such as a charge-transfer complex,with a biomolecule, including, but not limited to, a protein, such thatthe resulting bond has a high stability (i.e., stable under conditionsof mass spectrometric analysis, such as MALDI-TOF, as defined above).These reagents include those that interact strongly and with highspecificity with biomolecules, including, but not limited to, proteins,without forming covalent bonds through the interaction of complementaryaffinity surfaces. For example, well known binding pairs, such as biotinor streptavidin, antibody or antigen, receptor or ligand, lectin orcarbohydrate and other similar types of reagents, are readily adaptablefor use in these compounds as the reactive moiety X that will react withhigh affinity to biomolecules with surfaces similar to or identical tothe other member of the binding pair. These moieties are selected sothat the resulting conjugates (also referred to herein as complexes)have strong interactions that are sufficiently stable enough forsuitable washing of the unbound biomolecules, including, but not limitedto, proteins, out of the complexed biological mixtures.

The reactivity of X can be influenced by one or more selectivityfunctions Y on the core, i.e., M in the formula above, particularlywhere S² is not present.

The Y function, discussed below is employed for electronic (e.g.,mesomeric, inductive) and/or steric effects to modulate the reactivityof X and the stability of the resulting X-biomolecule linkage. In theseembodiments, biomolecule mixtures, including, but not limited to,protein mixtures, can react and be analyzed due to the modulation by Y,which changes the electronic or steric properties of X and, therefore,increases the selectivity of the reaction of X with the biomolecule.

In certain embodiments, X is an active ester, such as —C(═O)O-Ph-pNO₂,—C(═O)O—C₆F₅ or —C(═O)—O—(N-succinimidyl); an active halo moiety, suchas an α-halo ether or an α-halo carbonyl group, including, but notlimited to, —OCH₂—I, —OCH₂—Br, —OCH₂—Cl, —C(O)CH₂I, —C(O)CH₂Br and—C(O)CH₂Cl; amino acid side chain-specific functional groups, such asmaleimido (for cysteine), a metal complex, including gold or mercurycomplexes (for cysteine or methionine), an epoxide or isothiocyanate(for arginine or lysine); reagents that bind to active sites of enzymes,including, but not limited to, transition state analogs; antibodies,e.g., against phosphorylated peptides; antigens, such as a phage displaylibrary; haptens; biotin; avidin; or streptavidin.

3. Selectivity Functions “Y”

The selectivity functions (“Y”) serves to modulate the reactivityfunction by reducing the number of groups to which the reactivityfunctions bind, such as by steric hindrance and other interactions. Itis a group that modifies the steric and/or electronic (e.g., mesomeric,inductive effects) properties as well as the resulting affinityproperties of the capture compound. Selectivity functions include anyfunctional groups that increase the selectivity of the reactivity groupso that it binds to fewer different biomolecules than in the absence ofthe selectivity function or binds with greater affinity to biomoleculesthan in its absence. In the capture compounds provided herein, Y isallowed to be extensively varied depending on the goal to be achievedregarding steric hindrance and electronic factors as they relate tomodulating the reactivity of the cleavable bond L, if present, and thereactive functionality X. For example, a reactivity function X can beselected to bind to amine groups on proteins; the selectivity functioncan be selected to ensure that only groups exposed on the surface can beaccessed. The selectivity function is such that the compounds bind to orreact with (via the reactivity function) fewer different biomoleculeswhen it is part of the molecule than when it is absent and/or thecompounds bind with greater specificity and higher affinity. Theselectivity function can be attached directly to a compounds or can beattached via a linker, such as CH₂CO₂ or CH₂—O—(CH₂)_(n)—O, where n isan integer from 1 to 12, or 1 to 6, or 2 to 4. See, e.g., FIG. 17 andthe discussion below for exemplary selectivity functions.

In certain embodiments, each Y is independently a group that modifiesthe affinity properties and/or steric and/or electronic (e.g.,mesomeric, inductive effects) properties of the resulting capturecompound. For example, Y, in certain embodiments, is selected from ATPanalogs and inhibitors; peptides and peptide analogs; polyethyleneglycol(PEG); activated esters of amino acids, isolated or within a peptide;cytochrome C; and hydrophilic trityl groups.

In another embodiment, Y is a small molecule moiety, a natural product,a protein agonist or antagonist, a peptide or an antibody (see, e.g.,FIG. 17). In another embodiment, Y is a hydrophilic compound or protein(e.g., PEG or trityl ether), a hydrophobic compound or protein (e.g.,polar aromatics, lipids, glycolipids, phosphotriesters,oligosaccharides), a positive or negatively charged group, a smallmolecule, a pharmaceutical compound or a biomolecule that createsdefined secondary or tertiary structures.

In other embodiments, Y is a group that is a component of a luminescent,including fluorescent, phosphorescent, chemiluminescent andbioluminescent system, or is a group that can be detected in acolorimetric assay; in certain embodiments, Y is a monovalent groupselected from straight or branched chain alkyl, straight or branchedchain alkenyl, straight or branched chain alkynyl, cycloalkyl,cycloalkenyl, cycloalkynyl, heterocyclyl, straight or branched chainheterocyclylalkyl, straight or branched chain heterocyclylalkenyl,straight or branched chain heterocyclylalkynyl, aryl, straight orbranched chain arylalkyl, straight or branched chain arylalkenyl,straight or branched chain arylalkynyl, heteroaryl, straight or branchedchain heteroarylalkyl, straight or branched chain heteroarylalkenyl,straight or branched chain heteroarylalkynyl, halo, straight or branchedchain haloalkyl, pseudohalo, azido, cyano, nitro, OR⁶⁰, NR⁶⁰R⁶¹, COOR⁶⁰,C(O)R⁶⁰, C(O)NR⁶⁰R⁶¹, S(O)_(q)R⁶⁰, S(O)_(q)OR⁶⁰, S(O)_(q)NR⁶⁰R⁶¹,NR⁶⁰C(O)R⁶¹, NR⁶⁰C(O)NR⁶⁰R⁶¹, NR⁶⁰S(O)_(q)R⁶⁰, SiR⁶⁰R⁶¹R⁶², P(R⁶⁰)₂,P(O)(R⁶⁰)₂, P(OR⁶⁰)₂, P(O)(OR⁶⁰)₂, P(O)(OR⁶⁰)(R⁶¹) and P(O)NR⁶⁰R⁶¹,where q is an integer from 0 to 2;

each R⁶⁰, R⁶¹, and R6² is independently hydrogen, straight or branchedchain alkyl, straight or branched chain alkenyl, straight or branchedchain alkynyl, aryl, straight or branched chain aralkyl, straight orbranched chain aralkenyl, straight or branched chain aralkynyl,heteroaryl, straight or branched chain heteroaralkyl, straight orbranched chain heteroaralkenyl, straight or branched chainheteroaralkynyl, heterocyclyl, straight or branched chainheterocyclylalkyl, straight or branched chain heterocyclylalkenyl orstraight or branched chain heteorcyclylalkynyl.

Fluorescent, colorimetric and phosphorescent groups are known to thoseof skill in the art (see, e.g., U.S. Pat. No. 6,274,337; Sapan et al.(1999) Biotechnol. Appl. Biochem. 29 (Pt. 2):99-108; Sittampalam et al.(1997) Curr. Opin. Chem. Biol. 1(3):384-91; Lakowicz, J. R., Principlesof Fluorescence Spectroscopy, New York: Plenum Press (1983); Herman, B.,Resonance Energy Transfer Microscopy, in: Fluorescence Microscopy ofLiving Cells in Culture, Part B, Methods in Cell Biology, vol. 30, ed.Taylor, D. L. & Wang, Y.-L., San Diego: Academic Press (1989), pp.219-243; Turro, N. J., Modern Molecular Photochemistry, Menlo Park:Benjamin/Cummings Publishing Col, Inc. (1978), pp. 296-361 and theMolecular Probes Catalog (1997), OR, USA). Fluorescent moieties include,but are not limited to, 1- and 2-aminonaphthalene,p,p′-diaminostilbenes, pyrenes, quaternary phenanthridine salts,9-aminoacridines, p,p′-diaminobenzophenone imines, anthracenes,oxacarbocyanine, merocyanine, 3-aminoequilenin, perylene,bis-benzoxazole, bis-p-oxazolyl benzene, 1,2-benzophenazin, retinol,bis-3-aminopyridinium salts, hellebrigenin, tetracycline, sterophenol,benzimidazolylphenylamine, 2-oxo-3-chromen, indole, xanthen,7-hydroxycoumarin, phenoxazine, calicylate, strophanthidin, porphyrins,triarylmethanes and flavin. Fluorescent compounds that havefunctionalities for linking to a compound provided herein, or that canbe modified to incorporate such functionalities include, e.g., dansylchloride; fluoresceins such as 3,6-dihydroxy-9-phenylxanthhydrol;rhodamineisothio-cyanate; N-phenyl 1-amino-8-sulfonatonaphthalene;N-phenyl 2-amino-6-sulfonatonaphthalene;4-acetamido-4-isothiocyanato-stilbene-2,2′-disulfonic acid;pyrene-3-sulfonic acid; 2-toluidinonaphthalene-6-sulfonate;N-phenyl-N-methyl-2-aminoaphthalene-6-sulfonate; ethidium bromide;stebrine; auromine-0,2-(9′-anthroyl)palmitate; dansylphosphatidylethanolamine; N,N′-dioctadecyl oxacarbocyanine: N,N′-dihexyloxacarbocyanine; merocyanine, 4-(3′ pyrenyl)stearate;d-3-aminodesoxy-equilenin; 12-(9′-anthroyl)stearate; 2-methylanthracene;9-vinylanthracene; 2,2′(vinylene-p-phenylene)bisbenzoxazole;p-bis(2-(4-methyl-5-phenyl-oxazolyl))benzene;6-dimethylamino-1,2-benzophenazin; retinol; bis(3′-aminopyridinium)1,10-decandiyl diiodide; sulfonaphthylhydrazone of hellibrienin;chlorotetracycline;N-(7-dimethylamino-4-methyl-2-oxo-3-chromenyl)maleimide;N-(p-(2-benzimidazolyl)-phenyl)maleimide; N-(4-fluoranthyl)maleimide;bis(homovanillic acid); resazarin;4-chloro-7-nitro-2,1,3-benzooxadiazole; merocyanine 540; resorufin; rosebengal; and 2,4-diphenyl-3(2H)-furanone. Many fluorescent tags arecommercially available from Sigma Aldrich chemical company (Saint Louis,Mo.), Molecular Probes, R&D systems (Minneapolis, Minn.), Pharmacia LKBBiotechnology. (Piscataway, N.J.), Clontech Laboratories, Inc. (PaloAlto, Calif.), Chem Genes Corp., Aldrich Chemical Company (Milwaukee,Wis.), Glen Research, Inc., GIBCO BRL Life Technologies, Inc.(Gaithersberg, Md.), Fluka Chemica-Biochemika Analytika (Fluka ChemieAG, Buchs, Switzerland), and Applied Biosystems (Foster City, Calif.) aswell as other commercial sources known to one of skill in the art.

Chemiluminescent groups intended for use herein include any componentsof light generating systems that are catalyzed by a peroxidase andrequire superoxide anion (O) (and/or hydrogen peroxide (H₂O₂)) (see,e.g., Musiani et al. (1998) Histol. Histopathol. 13(1):243-8).Light-generating systems include, but are not limited to, luminol,isoluminol, peroxyoxalate-fluorophore, acridinium ester, lucigenin,dioxetanes, oxalate esters, acridan, hemin, indoxyl esters including3-O-indoxyl esters, naphthalene derivatives, such as7-dimethylamino-naphthalene-1,2-dicarbonic acid hydrazide and cypridinaluciferin analogs, including2-methyl-6-[p-methoxyphenyl]-3,7-dihyroimidazo[1,2-α]pyrazin-3-one,2-methyl-6-phenyl-3,7-dihyroimidazo[1,2-α]pyrazin-3-one and2-methyl-6-[p-[2-[sodium3-carboxylato-4-(6-hydroxy-3-xanthenon-9-yl]phenylthioureylene]ethyleneoxy]phenyl]-3,7-dihyroimidazo[1,2-α]pyrazin-3-one.In other embodiments, the chemiluminescent moieties intended for useherein include, but are not limited to, luminol, isoluminol,N-(4-aminobutyl)-N-ethyl isoluminol (ABEI), N-(4-aminobutyl)-N-methylisoluminol (ABMI), which have the following structures and participatein the following reactions:

where luminol is represented, when R is NH₂ and R¹ is H; isoluminol,when R is H and R¹ is NH₂; for ABEI((6-[N-(4-aminobutyl)-N-ethylamino]-2,3-dihyrophthalazine-1-4-dione),when R is H and R¹ is C₂H₅—N—(CH₂)₄NH₂; and for ABMI((6-[N-(4-aminobutyl)-N-methylamino]-2,3-dihyrophthalazine-1-4-dione),when R is H and R¹ is CH₃—N—(CH₂)₄NH₂.

Bioluminescent groups for use herein include luciferase/luciferincouples, including firefly [Photinus pyralis] luciferase, the Aequorinsystem (i.e., the purified jellyfish photoprotein, aequorin). Manyluciferases and substrates have been studied and well-characterized andare commercially available (e.g., firefly luciferase is available fromSigma, St. Louis, Mo., and Boehringer Mannheim Biochemicals,Indianapolis, Ind.; recombinantly produced firefly luciferase and otherreagents based on this gene or for use with this protein are availablefrom Promega Corporation, Madison, Wis.; the aequorin photoproteinluciferase from jellyfish and luciferase from Renilla are commerciallyavailable from Sealite Sciences, Bogart, Ga.; coelenterazine, thenaturally-occurring substrate for these luciferases, is available fromMolecular Probes, Eugene, Oreg.). Other bioluminescent systems includecrustacean, such as Cyrpidina (Vargula), systems; insect bioluminescencegenerating systems including fireflies, click beetles, and other insectsystems; bacterial systems; dinoflagellate bioluminescence generatingsystems; systems from molluscs, such as Latia and Pholas; earthworms andother annelids; glow worms; marine polycheate worm systems; SouthAmerican railway beetle; fish (i.e., those found in species ofAristostomias, such as A. scintillans (see, e.g., O'Day et al. (1974)Vision Res. 14:545-550), Pachystomias, and Malacosteus, such as M.niger; blue/green emmitters include cyclthone, myctophids, hatchet fish(agyropelecus), vinciguerria, howella, florenciella, and Chauliodus);and fluorescent proteins, including green (i.e., GFPs, including thosefrom Renilla and from Ptilosarcus), red and blue (i.e., BFPs, includingthose from Vibrio fischeri, Vibrio harveyi or Photobacteriumphosphoreum) fluorescent proteins (including Renilla mulleri luciferase,Gaussia species luciferase and Pleuromamma species luciferase) andphycobiliproteins.

Exemplary selectivity functions include, but are not limited to, ligandsthat bind to receptors such as insulin and other receptors (see, e.g.,the Table of ligands below); cyclodextrins; enzyme substrates; lipidstructures; prostaglandins; antibiotics; steroids; therapeutic drugs;enzyme inhibitors; transition state analogs; specific peptides that bindto biomolecule surfaces, including glue peptides; lectins (e.g., mannosetype, lactose type); peptide mimetics; statins; functionalities, such asdyes and other compounds and moieties employed for protein purificationand affinity chromatography. See e.g., FIG. 17, and the following tableof peptide ligands:

Exemplary peptide ligands Designation Sequence SEQ IDAdrenocorticotropic SYSMEHFRWG KPVGKKRRPV 1 hormone KVYPNGAEDE SAEAFPLEFAdrenomedullin YRQSMNNFQG LRSFGCRFGT 2 CTVQKLAHQI YQFTDKDKDN VAPRSKISPQGY Allatostatin I-IV APSGAQRLYGFGL 3 alpha MSH WGKPV(ac)SYSMEHFR 4alpha-Bag Cell Peptide APRERFYSE 5 alpha-Neo-endorphin YGGFLRKYPK 6Alytesin E*GRLGTQWAV GHLM-NH₂ 7 Amylin KCNTATCATN RLANFLVHSS 8NNFGAILSST NVGSNTY Angiotensin-1 DRVYIHPFHL 9 Angiotensin-2 DRVYIHPF 10Angiotensin-3 RVYIHPF 11 Apelin-13 NRPRLSHLGPMPF 12 Astressin*FHLLREVLE*IARAEQLAQEAHKNRL 13 *IEII Atrial Natriuretic PeptideSLRRSSCFGG RMDRIGAQSG 14 LGCNSFRY Autocamtide 2 KKALRRQETV DAL 15 BAM12YGGFMRRVGR PE 16 BAM18 YGGFMRRVGR PEWW 17 BAM22 YGGFMRRVGR PE 18 BetaEndorphins (“44”) YGGFMTSEKS QTPLVTLFKN 19 AIIKNAYKKG E beta MSHAEKKDEGPYR MEHFRWGSPP KD 20 beta-Neo-endorphin YGGFLRKYP 21 BetaAmyloidDAEFRHASGYE VHHQKLVFFAE 22 DVGSNLGAIIG LMVGGVVIAT Beta-Bag Cell PeptideRLRFH 23 BNP SPKMVQGSGC FGRKMDRISS 24 SSGLGCKVLR RH Bradykinin RPPGFSPFR25 Buccalin GMDSLAFSGG L-NH₂ 26 Bursin KHG-NH₂ 27 C3 (undeca peptide)ASKKPKRNIKA 28 Caerulein *EQDY(SO3H)TGWMDF 29 Calcineurin AIP ITSFEEAKGLDRINERMPPR 30 RDAMP Calcitonin CGNLSTCMLG TYTQDFNKFH 31 TFPQTAIGVG APCalpain Inhibitor (“42”) DPMSSTYIEE LGKREVTIPP 32 KYRELLA CAP-37NQGRHFCGGA EIHARFVMTA ASCFN 33 Cardiodilatin * NPMYNAVSNA DLMDFKNLLD 34HLEEKMPLED CD36peptideP (139-155) CNLAVAAASH IYQNQFVQ 35 Cecropin BKWKVFKKIEK MGRNIRNGIV 36 KAGPAIAVLG EAKAL Cerebellin SGSAKVAFSA IRSTNH37 CGRP-1 ACDTATCVTH RLAGLLSRSG 38 GVVKNNFVPT NVGSKAF CGRP-2 ACNTATCVTHRLAGLLSRSG 39 GMVKSNFVPT NVGSKAF CKS17 LQNRRGLDLL FLKEGGL 40Cortistatins QEGAPPQQSA RRDRMPCRNF 41 FWKTFSSCK Crystalline WG 42Defensin 1 HNP1 ACYCRIPACI AGERRYGTCI 43 YQGRLWAFCC Defensin HNP2CYCRIPACIA GERRYGTCIY 44 QGRLWAFCC Dermaseptin ALWKTMLKKL GTMALHAGKA 45ALGAAADTIS QTQ Dynorphin-A YGGFLRRIRP KLKWDNQ 46 Dynorphin-B YGGFLRRQFKVVT 47 Eledoisin E*PSKDAFIGLM-NH₂ 48 Endomorphin-1 YPWF 49 Endomorphin-2YPFF 50 Endothelin-1 CSCSSLMDKE CVYFCHLDII W 51 Exendin-4 HSDGTFTSDLSKQMEEEAVR 52 LFIEWLKNGG PSSGAPPPS(NH₂) Fibrinopeptide AADSGEGDFLAEGGGVR 53 Fibrinopeptide BQGVNDNEEGF FSAR 54 Fibronectin CS1 EILDVPST 55FMRF FMRF 56 Galanin GWTLNSAGYL LGPHAVGNHR 57 SFSDKNGLTS GalantideGWTLNSAGYL LGPQQFFGLM(NH₂) 58 gamma-Bag Cell Peptide RLRFD 59 GastrinEGPWLEEEEE AYGWMDF 60 Gastrin Releasing VPLPAGGGTV LTKMYPRGNH 61 WAVGHLMGhrelin GSSFLSPEHQ RVQQRKESKK 62 PPAKLQPR GIP YAEGTFISDY SIAMDKIHQQ 63DFVNWLLAQK GKKNDWKHNI TQ Glucagon HSQGTFTSDY SKYLDSRRAQ 64 DFVDWLMNTGrb-7 SH2 domain-1 RRFA C DPDG YDN YFH C VPGG 65 Grb-7 SH2 domain-10TGSW C GLMH YDN AWL C NTQG 66 Grb-7 SH2 domain-11 RSKW C RDGY YAN YPQ CWTQG 67 Grb-7 SH2 domain-18 RSTL C WFEG YDN TFP C KYFR 68 Grb-7 SH2domain-2 RVQE C KYLY YDN DYL C KDDG 69 Grb-7 SH2 domain-23 GLRR C LYGPYDN AWV C NIHE 70 Grb-7 SH2 domain-3 KLFW C TYED YAN EWP C PGYS 71 Grb-7SH2 domain-34 FCAV C NEEL YEN CGG C SCGK 72 Grb-7 SH2 domain-46 RTSP CGYIG YDN IFE C TYLG 73 Grb-7 SH2 domain-5 TGEW C AQSV YAN YDN C KSAW 74Grb-7 SH2 domain-6 NVSR C TYIH YDN WSL C GVEV 75 Grb-7 SH2 domain-8 GVSNC VFWG YAN DWL C SDYS 76 Growth hormone YADAIFTNSY RKVLGQLSAR 77releasing factor KLLQDIMSRQ QGESNQERGA RARL Guanylin PGTCEICAYA ACTGC 78Helodermin HSDAIFTEEY SKLLAKLALQ 79 KYLASILGSR TSPPP-NH₂ Helospectin-1HSDATFTAEY SKLLAKLALQ 80 KYLESILGSS TSPRPPSS Helospectin-2 HSDATFTAEYSKLLAKLALQ 81 KYLESILGSS TSPRPPS Histatin 5 DSHAKRHHGY KRKFHEKHHS HRGY82 ICE inhibitor(III) ac-YVAD-fluroacyloxymethylketone 83Immunostimulating VEPIPY 84 Peptide Insulin (A-chain) GIVEQCCTSICSLYQLENYC N 85 Insulin (B-chain) FVNQHLCGSH LVEALYLVCG 86 ERGFFYTPKTInsulin (whole molecule) see above 87 Kinetensin IARRHPYFL 88Leu-Enkephalin YGGFL 89 Litorin E*QWAVGHFM-NH₂ 90 Malantide RTKRSGSVYEPLKI 91 Met-Enkephalin YGGFM 92 Metorphamide YGGGFMRRV-NH₂ 93 MotilinFVPIFTYGEL QRMQEKERNK GQ 94 Myomodulin PMSMLRL-NH₂ 95 Myosin KinaseIPKKRAARATS-NH₂ 96 Necrofibrin GAVSTA 97 Neurokinin A HKTDSFVGLM-NH₂ 98Neurokinin B DMHDFFVGLM-NH₂ 99 Neuromedin B GNLWATGHFM-NH₂ 100Neuropeptide Y YPSKPDNPGE DAPAEDMARY 101 YSAKRHYINL ITRQRY-NH₂Neurotensin E*LYENKPRRPUIL 102 Nociceptin FGGFTGARKS ARKLANQ 103Nociceptin/Orphanin FQ FAEPLPSEEE GESYSKEVPE 104 MEKRYGGFMR F NocistatinEQKQLQ 105 Orexin A E*PLPDCCRQKTCSCRLYELLHGAGN 106 HAAGILTL-NH₂ Orexin BRSGPPGLQGR LQRLLQASGN 107 HAAGILTM-NH₂ Osteocalcin YLYQWLGAPV PYPDPLEPRR108 EVCELNPDCD ELADHIGFQE AYRRFYGPV Oxytocin CYIQNCPLG-NH₂ 109 PACAPHSDGIFTDSY SRYRKQMAVK 110 KYLAAVL PACAP-RP DVAHGILNEA YRKVLDQLSA 111GKHLQSLVA Pancreatic Polypeptide APLEPVYPGD NATPEQMAQY 112 AADLRRYINMLTRPRY-NH₂ Papain Inhibitor GGYR 113 Peptide E YGGFMRRVGR PE 114 PeptideYY YPIKPEAPGE DASPEELNRY 115 YASLRHYLNL VTRQRY-NH₂ Phosphate acceptorRRKASGPPV 116 Physalaemin E*ADPNKFYGLM-NH₂ 117 RanatensinE*VPQWAVGHFM-NH₂ 118 RGD peptides X-RGD-X 119 Rigin GQPR 120 RR-SRCRRLIEDAEYA ARG 121 Schizophrenia RPTVL 122 Secretin HSDGTFTSELSRLREGARLQ 123 RLLQGLV Serum Thymic Factor E*AKSQGGSN 124structural-site zinc PQCGKCRICK NPESNYCLK 125 ligands-alphastructural-site zinc PQCGKCRVCK NPESNYCLK 126 ligands-betastructural-site zinc PQCGKCRICK NPESNYCLK 127 ligands-gammastructural-site-zinc PLCRKCKFCLSPLTNLCGK 128 ligands-pistructural-site-zinc PQGECKFCLNPKTNLCQK 129 ligands-X Substance PRPKPQQFFGL M-NH₂ 130 Syntide 2 PLARTLSVAG LPGKK 131 Systemin AVQSKPPSKRDPPKMQTD 132 Thrombin-light chain TFGSGEADCG LRPLFEKKSL 133 EDKTERELLESYIDGR Thymopentin RKDVY 134 Thymus Factor QAKSQGGSN 135 TRH E*HP 136Tuftsin TKPR 137 Uperolein E*PDPNAFYGLM-NH₂ 138 Uremic PentapeptideDLWQK 139 Urocortin DNPSLSIDLT FHLLRTLLEL 140 ARTQSQRERA EQNRIIFDSVUroguanylin NDDCELCVNV ACTGCL 141 Vasonatrin GLSKGCFGLK LDRIGSMSGL 142GCNSFRY Vasopressin CYFQNCPRG 143 Vasotocin CYIQNCPRG 144 VIP HSDAVFTDNYTRLRKQMAVK 145 KYLNSILN Xenin MLTKFETKSA RVKGLSFHPK RPWIL 146 YXN motifTyr-X-Asn 147 Zinc ligand of carbonic FQFHFHWGS 148 anhydrase I Zincligand of carbonic IIIQFHFHWGS 149 anhydrase

Other selections for Y are can be identified by those of skill in theart and include, for example, those disclosed in Techniques in ProteinChemistry, Vol. 1 (1989) T. Hugli ed. (Academic Press); Techniques inProtein Chemistry, Vol. 5 (1994) J. W. Crabb ed. (Academic Press);Lundblad Techniques in Protein Modification (1995) (CRC Press, BocaRaton, Fla.); Glazer et al. (1976) Chemical Modification of Proteins(North Holland (Amsterdam)) (American Elsevier, New York); and Hermanson(1996) Bioconjugate Techniques (Academic Press, San Diego, Calif.).

4. Sorting Functions “Q”

The compounds provided herein can include a sorting function (“Q”),which permits the compounds to be addressed, such as by capture in a 2-Darray. The sorting functions are “tags,” such oligonucleotide tags, suchthat when the compounds are bathed over an array of complementaryoligonucleotides linked to solid supports, such as beads, chips, undersuitable binding conditions, the oligonucleotides hybridize. Theidentity of the capture compound can be known by virtue of its positionin the array. Other sorting functions can be optically coded, includingas color coded or bar coded beads that can be separated, or anelectronically-tagged, such as by providing microreactor supports withelectronic tags or bar coded supports (see, e.g., U.S. Pat. No.6,025,129; U.S. Pat. No. 6,017,496; U.S. Pat. No. 5,972,639; U.S. Pat.No. 5,961,923; U.S. Pat. No. 5,925,562; U.S. Pat. No. 5,874,214; U.S.Pat. No. 5,751,629; U.S. Pat. No. 5,741,462), or chemical tags (see,e.g., U.S. Pat. No. 5,432,018; U.S. Pat. No. 5,547,839) or colored tagsor other such addressing methods that can be used in place of physicallyaddressable arrays. The sorting function is selected to permit physicalarraying or other addressable separation method suitable for analysis,particularly mass spectrometric, including MALDI, analysis.

Other sorting functions for use in the compounds provided herein includebiotin, 6-His, BODIPY, oligonucleotides, nucleosides, nucleotides,antibodies immunotoxin conjugates, adhesive peptides, lectins,liposomes, PNA, activated dextrans and peptides. In one embodiment, thesorting function is an oligonucleotide, particularly, either asingle-stranded or partially single-stranded oligonucleotide to permithybridization to single-stranded regions on complementaryoligonucleotides on solid supports.

In one embodiment of the capture compounds provided herein, Q is asingle stranded unprotected or suitably protected oligonucleotide oroligonucleotide analog (e.g., PNA) of up to 50 building blocks, which iscapable of hybridizing with a base-complementary single stranded nucleicacid molecule. In certain embodiments, Q contains from about 5 up toabout 10, 15, 25, 30, 35, 40, 45 or 50 building blocks.

Biomolecule mixtures, including, but not limited to, protein mixtures,can have different hydrophobicities (solubility) than the compoundsprovided herein. In certain embodiments, in order to achieve highreaction yields between the functionality X on the compounds providedherein and the protein surface, the reaction is performed in solution.In other embodiments, the reaction is performed at a solid/liquid orliquid/liquid interface. In certain embodiments, the solubilityproperties of the compounds provided herein are dominated by the Qmoiety. A change in the structure of Q can, in these embodiments,accommodate different solubilities. For example, if the protein mixtureis very water soluble, Q can have natural phosphodiester linkages; ifthe bimolecular mixture is very hydrophobic (lipids, glycolipids,membrane proteins, lipoproteins), Q can have it's phosphodiester bondsprotected as phosphotriesters, or alternatively, these bonds can bemethylphos-phonatediesters or peptide nucleic acids (PNAs). If thebiomolecule mixture is of an intermediate hydrophobicity, solubility isachieved, e.g., with phosphothioate diester bonds. Intermediatesolubility also can be attained by mixing phosphodiester withphosphotriester linkages. Those skilled in the art can easily conceiveof other means to achieve this goal, including, but not limited to,addition of substituents on Z, as described elsewhere herein, or use ofbeads for Z that are hydrophobic, including, but not limited to,polystyrene, polyethylene, polypropylene or teflon, or hydrophilic,including, but not limited to, cellulose, dextran cross-linked withepichlorohydrin (e.g., Sephadex®), agarose (e.g., Sepharose®), lectins,adhesive polypeptides, and polyacrylamides.

The flexibility of being able to change the solubility of the compoundsis a significant advantage over current methods. In contrast, 2D gelelectrophoresis is useful only for analysis of water soluble proteinswith the result that about 30 to 35% of all cellular proteins, such asthose residing in the cell membrane, cannot be analyzed by this method.This is a severe limitation of 2D gel electrophoresis since manyproteins, including, but not limited to, those involved in tissuespecific cell-cell contacts, signal transduction, ion channels andreceptors, are localized in the cell membrane.

In one embodiment, after reaction or complexation of the compoundsprovided herein with a biomolecule, including, but not limited to, aprotein, the compounds are brought into contact with a set of spatiallyresolved complementary sequences on a flat support, beads or microtiterplates under hybridization conditions.

In certain embodiments, Q is a monovalent oligonucleotide oroligonucleotide analog group that is at least partially single strandedor includes a region that can be single-stranded for hybridization tocomplementary oligonucleotides on a support. Q can have the formula:N¹ _(m)—B_(i)—N² _(n)—

where N¹ and N² are regions of conserved sequences; B is a region ofsequence permutations; m, i and n are the number of building blocks inN¹, B and N², respectively; and the sum of m, n and i is a number ofunits able to hybridize with a complementary nucleic acid sequence toform a stable hybrid. Thus, in embodiments where B is a single strandedDNA or RNA, the number of sequence permutations is equal to 4^(i). Inone embodiment, the sum of m, n and i is about 5 up to about 10, 15, 25,30, 35, 40, 45 or 50. In certain embodiments m and n are eachindependently 0 to about 48, or are each independently about 1 to about25, or about 1 to about 10 or 15, or about 1 to about 5. In otherembodiments, i is about 2 to about 25, or is about 3 to about 12, or isabout 3 to about 5, 6, 7 or 8.

The oligonucleotide portion, or oligonucleotide analog portion, of thecompounds (N¹ _(m)—B_(i)—N² _(n)—), can be varied to allow optimal sizefor binding and sequence recognition. The diversity of the sequencepermutation region B can be relatively low if the biomolecule mixture,including, but not limited to, protein mixtures, is of low complexity.If the mixture is of high complexity, the sequence region B has to be ofhigh diversity to afford sufficient resolving power to separate all thespecies. The flanking conserved regions N¹ _(m) and N² _(n), need onlybe long enough to provide for efficient and stable hybrid formation.There is, however, flexibility in designing these regions: N¹ _(m) andN² _(n) can be of the same length and same sequence, of the same lengthand different sequence or of different length and different sequence. Incertain embodiments, including those where B is of sufficient length toprovide stable hybrid formation, N¹ and/or N² are absent. In theseembodiments, the oligonucleotide portion of the compounds, oroligonucleotide analog portion of the compounds, has the formula or N¹_(m)—B_(i)—, or B_(i)—N² _(n)—, or B_(i)—.

In an exemplary embodiment (see, e.g., EXAMPLE 1.a.), B has atrinucleotide sequence embedded within a 11-mer oligonucleotidesequence, where the N¹ _(m) and N² _(n) tetranucleotide sequencesprovide flanking identical (conserved) regions. This arrangement for N¹_(m)—B_(i)—N² _(n)— affords 64 different compounds where each compoundcarries the same reactive functionality X. In another exemplaryembodiment (see, e.g., EXAMPLE 1.b.), B has a tetranucleotide sequenceembedded within a 12-mer oligonucleotide sequence, where the N¹ _(m) andN² _(n) oligonucleotide sequences provide flanking but not identicaloctanucleotide sequences. This arrangement for N¹ _(m)—B_(i)—N² _(n)—affords 256 different compounds where each carry the same reactivefunctionality X. In a further exemplary embodiment (see, e.g., EXAMPLE1.c.), B has an octanucleotide sequence embedded within a 23-meroligonucleotide sequence, where the N¹ _(m) and N² _(n) oligonucleotidesequences provide flanking but not identical octanucleotide sequences.This arrangement for N¹ _(m)—B_(i)—N² _(n)— affords 65,536 differentcompounds where each carries the same reactive functionality X, andexceeds the estimated complexity of the human proteome (e.g.,30,000-35,000 different proteins). In certain embodiments, use of a Bwith excess permutations for the complexity of the protein mixture, asthe oligonucleotides with the best hybridization properties can be usedfor analysis to reduce mismatching.

5. Solubility Functions “W”

The compounds provided herein can include a solubility function, W, toconfer desired solubility properties, such as solubility in hydrophobicenvironments or hydrophilic environments to permit probing ofbiomolecules in physiological environments, such as in membranes.Exemplary solubility functions for use in the compounds provided hereininclude polyethylene glycols, sulfates, polysulfates, phosphates,sulfonates, polysulfonates, carbohydrates, dextrin, polyphosphates,poly-carboxylic acids, triethanolamine, alcohols, water solublepolymers, salts of alkyl and aryl carboxylic acids and glycols.

Amphiphilic compounds, such as quaternary ammonium salts (i.e., betain,choline, spingomyelin, tetramethyl (or tetrabutyl) alkyl ammonium salts,cationic, ionic and neutral tensides may also be used as the solubilityfunction W.

In other embodiments, W also can be used to modulate the solubility ofthe compounds to achieve homogeneous solutions, if desired, whenreacting with biomolecule mixtures, including, but not limited to,protein mixtures. In certain embodiments, W is a sulfonate, a polarfunctionality that can be used to make the compounds more water-soluble.In other embodiments, W is a hydrophobic group, including lower alkyl,such as tert-butyl, tert-amyl, isoamyl, isopropyl, n-hexyl, sec-hexyl,isohexyl, n-butyl, sec-butyl, iso-butyl and n-amyl, or an aryl group,including phenyl or naphthyl.

6. Exemplary Embodiments

The following provides exemplary capture compounds that exhibit theabove-described properties. It is understood that these are exemplaryonly and that any compounds that can react covalently with a biomoleculeor by other highly stable interaction that is stable to analyticconditions, such as those of mass spectrometric analysis, and that cansorted or otherwise identified are contemplated for use in thecollections.

a. Exemplary Embodiment 1

In one embodiment, the compounds for use in the methods provided hereinhave formulae:Q-Z—X or Q-Z—Y,

where Q is a sorting function that contains a single strandedunprotected or suitably protected oligonucleotide or oligonucleotideanalog (e.g., peptide nucleic acid (PNA)) of up to 50 building blocks,which is capable of hybridizing with a base-complementarysingle-stranded nucleic acid molecule;

Z is a moiety that is cleavable prior to or during analysis of abiomolecule, including mass spectral analysis, without altering thestructure of the biomolecule, including, but not limited to, a protein;

X is a reactivity functional group that interacts with and/or reactswith functionalities on the surface of a biomolecule, including, but notlimited to, a protein, to form covalent bonds or bonds that are stableunder conditions of mass spectrometric analysis, particularly MALDIanalysis; and

Y is a selectivity functional group that interacts with and/or reacts byimposing unique selectivity by introducing functionalities that interactnoncovalently with target proteins.

b. Exemplary Embodiment 2

In another embodiment, the compounds for use in the methods providedherein have formula:

where Q is a single-stranded unprotected or suitably protectedoligonucleotide or oligonucleotide analog (e.g., peptide nucleic acid(PNA)) of up to 50 building blocks, which is capable of hybridizing witha base-complementary single stranded nucleic acid molecule;

Z is a moiety that is cleavable prior to or during analysis of abiomolecule, including mass spectral analysis, without altering thestructure of the biomolecule, including, but not limited to, a protein;

X is a functional group that interacts with and/or reacts withfunctionalities on the surface of a biomolecule, including, but notlimited to, a protein, to form covalent bonds or bonds that are stableunder conditions of mass spectrometric analysis, particularly MALDIanalysis; and

Y is a functional group that interacts with and/or reacts by imposingunique selectivity by introducing functionalities that interactnoncovalently with target proteins.

c. Exemplary Embodiment 3

In another embodiment, the compounds for use in the methods providedherein have formula:

where Q is a sorting function that is a compound, or one or morebiomolecules (e.g., a pharmaceutical drug preparation, a biomolecule,drug or other compound that immobilizes to the substrate and capturestarget biomolecules), which is(are) capable of specific noncovalentbinding to a known compound to produce a tightly bound capture compound;

Z is a moiety that is cleavable prior to or during analysis of abiomolecule, including mass spectral analysis, without altering thestructure of the biomolecule, including, but not limited to, a protein;

X is a functional group that interacts with and/or reacts withfunctionalities on the surface of a biomolecule, including, but notlimited to, a protein, to form covalent bonds or bonds that are stableunder conditions of mass spectrometric analysis, particularly MALDIanalysis; and

Y is a functional group that interacts with and/or reacts by imposingunique selectivity by introducing functionalities that interactnoncovalently with target proteins.

d. Exemplary Embodiment 4

In another embodiment, the compounds for use in the methods providedherein have the formulae:

or Q-Z—(X)_(m) or Q-Z—(Y)_(n),where Q, Z, X and Y are as defined above; m is an integer from 1 to 100,in one embodiment 1 to 10, in another embodiment 1 to 3, 4 or 5; and nin an integer from 1 to 100, in one embodiment 1 to 10, in anotherembodiment 1 to 3, 4 or 5.

e. Other Exemplary Embodiments

In other embodiments, X is a pharmaceutical drug. The compounds of theseembodiments can be used in drug screening by capturing biomolecules,including but not limited to proteins, which bind to the pharmaceuticaldrug. Mutations in the biomolecules interfering with binding to thepharmaceutical drug are identified, thereby determining possiblemechanisms of drug resistance. See, e.g., Hessler et al. (Nov. 9-11,2001) Ninth Foresight Conference on Molecular Nanotechnology (Abstract)“www.foresight.org/Conferences/MNT9/Abstracts/Hessler”.

f. Other Embodiments

In certain embodiments, the compounds provided herein have the formula:N¹ _(m)—B_(i)—N² _(n)—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)-L-Xwhere N¹, B, N², S¹, M, S², L, X, m, i, n, t, a and b are as definedabove. In further embodiments, the compounds for use in the methodsprovided herein include a mass modifying tag and have the formula:N¹ _(m)—B_(i)—N² _(n)—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)-L-T-X,whereN¹, B, N², S¹, M, S², L, T, X, m, i, n, t, a and b are as defined above.

In other embodiments, including those where Z is not a cleavable linker,the compounds provided herein have the formula:N¹ _(m)—B_(i)—N² _(n)—(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)—X,where N¹, B, N², S¹, M, S², X, m, i, n, t, a and b are as defined above.

In another embodiment, the compounds for use in the methods providedherein include those of formulae:

where L and M are each independently O, S or NR³; X is a reactivityfunction, as described above; Y is a selectivity function, as describedabove; Q is a sorting function, as described above; and each R³ isindependently hydrogen, substituted or unsubstituted alkyl, substitutedor unsubstituted alkenyl, substituted or unsubstituted alkynyl,substituted or unsubstituted cycloalkyl, substituted or unsubstitutedheterocyclyl, substituted or unsubstituted aryl, substituted orunsubstituted heteroaryl, substituted or unsubstituted aralkyl, orsubstituted or unsubstituted heteroaralkyl.

In another embodiment, the capture compounds provided herein have theformula:

where L, M, X, Y and Q are as defined above.

In another embodiment, the capture compounds provided herein have theformula:

where X, Y, Q and S¹ are as defined above.

In another embodiment, the capture compounds provided herein have theformula:

where Q, Y, X and S¹ are as defined above.

In another embodiment, the capture compounds provided herein have theformula:

where X, Y, Q and W are as defined above.

In another embodiment, the capture compounds provided herein have theformulae:

where X, Y, Q and W are selected as above; and R is substituted orunsubstituted alkyl, substituted or unsubstituted cycloalkyl,substituted or unsubstituted cycloalkylalkyl, or substituted orunsubstituted aralkyl. In another embodiment, R is selected fromcyclohexyl, cyclohexyl-(CH₂)_(n)—, isopropyl, and phenyl-(CH₂)_(n)—,where n is 1, 2 or 3. As shown in the formulae above, R is optionallysubstituted with W.

In other embodiments, the compounds for use in the methods providedherein include:

Specific compounds within these embodiments are those resulting from allcombinations of the groups listed above for the variables contained inthis formula and all can include Q groups. It is intended herein thateach of these specific compounds is within the scope of the disclosureherein.

D. Preparation of the Capture Compounds

The capture compounds are designed by assessing the target biomoleculesand reaction conditions. For example, if the target biomolecules areproteins, X functions suitable to effect covalent or binding to proteinswith high affinity are selected. Y is selected according to thecomplexity of the target mixture and the desired specificity of bindingby X. Q is selected according the number of divisions of the mixturethat are desired; and W is selected based upon the environment of thebiomolecules that is probed. A variety of capture compounds are designedaccording to such criteria.

The capture compounds once designed can be synthesized by methodsavailable to those of skill in the art. Preparation of exemplary capturecompounds is described below. Any capture compound or similar capturecompound can be synthesized according to a method discussed in generalbelow or by minor modification of the methods by selecting appropriatestarting materials or by methods known to those of skill in the art.

In general, the capture compounds can prepared starting with the centralmoiety Z. In certain embodiments, Z is —(S¹)_(t)-M(R¹⁵)_(a)—(S²)_(b)-L-.In these embodiments, the capture compounds can be prepared startingwith an appropriately substituted (e.g., with one or more R¹⁵ groups) Mgroup. M(R¹⁵)_(a) is optionally linked with S¹ and/or S², followed bylinkage to the cleavable linker L. Alternatively, the L group isoptionally linked to S², followed by reaction with M(R¹⁵)_(a), andoptionally S¹. This Z group is then derivatized on its S¹ (orM(R¹⁵)_(a)) terminus to have a functionality for coupling with anoligonucleotide or oligonucleotide analog Q (e.g., a phosphoramidite,H-phosphonate, or phosphoric triester group). The Q group will generallybe N-protected on the bases to avoid competing reactions uponintroduction of the X moiety. In one embodiment, the Z group is reactedwith a mixture of all possible permutations of an oligonucleotide oroligonucleotide Q (e.g., 4^(i) permutations where i is the number ofnucleotides or nucleotide analogs in B). The resulting Q-Z capturecompound or capture compounds is(are) then derivatized through the Lterminus to possess an X group for reaction with a biomolecule, such asa protein. If desired, the N-protecting groups on the Q moiety are thenremoved. Alternatively, the N-protecting groups can be removed followingreaction of the capture compound with a biomolecule, including aprotein. In other embodiments, Q can be synthesized on Z, includingembodiments where Z is an insoluble support or substrate, such as abead. In a further embodiment, Q is presynthesized by standard solidstate techniques, then linked to M. Alternatively, Q can be synthesizedstepwise on the M moiety.

Provided below are examples of syntheses of the capture compoundsprovided herein containing alkaline-labile and photocleavable linkers.One of skill in the art can prepare other capture compounds disclosureby routine modification of the methods presented herein, or by othermethods known to those of skill in the art.

For synthesis of a compound provided herein containing analkaline-labile linker, 1,4-di(hydroxymethyl)benzene (i.e., M) ismono-protected, e.g., as the corresponding mono-tert-butyldimethylsilylether. The remaining free alcohol is derivatized as the corresponding2-cyano-ethyl-N,N-diisopropylphosphoramidite by reaction with2-cyanoethyl-N,N-diisopropylchlorophosphoramidite. Reaction of thisamidite with an oligonucleotide, (i.e., Q), is followed by removal ofthe protecting group to provide the corresponding alcohol. Reactionwith, e.g., trichloromethyl chloroformate affords the illustratedchloroformate (i.e., X).

For the synthesis of a compound provided herein containing aphotocleavable linker, 2-nitro-5-hydroxybenzaldehyde (i.e., a precursorof L) is reacted with, e.g., 3-bromo-1-propanol to give thecorresponding ether-alcohol. The alcohol is then protected, e.g., as thecorresponding tert-butyldimethylsilyl ether. Reaction of this compoundwith trimethylaluminum gives the corresponding benzyl alcohol, which isderivatized as its phosphoramidite using the procedure described above.The amidite is reacted with an oligonucleotide (i.e., Q), followed byremoval of the protecting group and derivatization of the resultingalcohol as the corresponding chloroformate (i.e., X).

For the synthesis of the compounds provided herein containing an acidlabile linker, e.g., a heterobifunctional trityl ether, the requisitephosphoramidite trityl ether is reacted with the oligonucleotide oroligonucleotide analog Q, followed by deprotection of the trityl etherand capture of a biomolecule, e.g., a protein, on the alcohol via areactive derivative of the alcohol (X), as described above.

The above syntheses are exemplary only. One of skill in the art will beable to modify the above syntheses in a routine manner to synthesizeother compounds within the scope of the instant disclosure. Syntheses ofcapture compounds as provided herein are within the skill of the skilledartisan.

E. Methods of Use of the Compounds

The capture compounds provided herein can be used for the analysis,quantification, purification and/or identification of the components ofbiomolecule mixtures, including, but not limited to, protein mixtures.They can be used to screen libraries of small molecules to identify drugcandidates, and they can be used to assess biomolecule-biomoleculeinteractions and to identify biomolecule complexes and intermediates,such as those in biochemical pathways and other biologicalintermediates.

To initiate an analytical process, mixtures of biomolecules are obtainedor prepared. They can then be pre-purified or partially purified asneeded, according to standard procedures. Biomolecules are isolated fromsamples using standard methods. FIG. 20 a depicts an exemplary captureassay in which capture compounds are bound to biomolecules and analyzedby MALDI-TOF MS. Example 9 and FIGS. 20 b-f show results of exemplaryassays using a variety of capture compounds and known proteins.

1. General Methods

The collections provided herein have a wide variety of applications,including reducing the complexity of mixtures of molecules, particularlybiomolecules, by contacting the collection with the mixtures to permitcovalent binding of molecules in the mixtures. The capture compounds canbe arrayed by virtue of the sorting function either before, during orafter the contacting. Following contacting and arraying the loci of thearray each contain a subset of the molecules in the mixture. The arraycan then be analyzed, such as by using mass spectrometry.

For example, proteins are isolated from biological fluids and/or tissuesby cell lysis followed, for example, by either precipitation methods(e.g., ammonium sulfate) or enzymatic degradation of the nucleic acidsand carbohydrates (if necessary) and the low molecular weight materialis removed by molecular sieving. Proteins also can be obtained fromexpression libraries. Aliquots of the protein mixture are reacted withthe collections of capture compounds, generally members of thecollection have different functionalities, such as different reactivityand/or selectivity, to separate the mixture into separate proteinfamilies according to the selected reactivity of X or the reactivityfunction plus the selectivity function. The diversity (number ofdifferent) selected for the sorting function Q depends on the complexityof the target mixture of biomolecules, such as proteins. Hence, forexample, where there are sets of compounds differing in X and Y,solubility function and Q is an oligonucleotide, B is selected of anappropriate length to provide for sufficient number loci in theresulting array so that ultimately each “spot” on the array has about 5to 50 or so biomolecules bound to a particular capture compound. Ingeneral, although not necessarily, all capture compounds with aparticular “Q” are the same, so that each “spot” on the resulting arraycontains the same capture compounds. There, however, are embodiments, inwhich a plurality of different capture compounds can have the same Qfunctionality.

As noted, an array encompasses not only 2-D arrays on solid supports butany collection that is addressable or in which members are identifiable,such as by tagging with colored beads or RF tags or chemical tags orsymbologies on beads. “Spots” or loci on the array, collections wherecapture compounds are sorted according to their “Q” function areseparated.

In certain embodiments, the analysis is conducted using the smallestpossible number of reactions necessary to completely analyze themixture. Thus, in these embodiments, selection of the diversity of Q andof the number of X and X/Y groups of different reactivity will be afunction of the complexity of the biomolecule mixture to be analyzed.Minimization of the diversity of B and the number of X and/or X/Y groupsallows for complete analysis of the mixture with minimal complexity.

The separation of proteins from a complex mixture is achieved by virtueof the compound-protein products bound to different members of thecollection. The supernatant, which contains the capture compound-proteinproducts, is contacted with support bound or otherwise labeled oraddressed recipient molecules, such as oligonucleotides on a support andallowed to bind, such as by hybridization to an array of complementaryoligonucleotides. In one embodiment, a flat solid support that carriesat spatially distinct locations, an array of oligonucleotides oroligonucleotide analogs that is complementary to the selected N¹_(m)—B_(i)—N² _(n) oligonucleotide or oligonucleotide analog, ishybridized to the capture compound-biomolecule products.

In embodiments where Z is an insoluble support or substrate, such as abead, separation of the compound-protein products into an addressablearray can be achieved by sorting into an array of microwell ormicrotiter plates, or other microcontainer arrays or by labeling with anidentifiable tag. The microwell or microtiter plates, ormicrocontainers, can include single-stranded oligonucleotides oroligonucleotide analogs that are complementary to the oligonucleotide oroligonucleotide analog Q.

After reaction or complexation of the compounds with the proteins, anyexcess compounds can be removed by adding a reagent designed to act as a“capturing agent.” For example, a biotinylated small molecule, which hasa functionality identical or similar to that which reacted with theselected X, is allowed to react with any excess compound. Exposure ofthis mixture to streptavidin bound to a magnetic bead, allows forremoval of the excess of the compounds.

Hybridization of the compound-protein products to a complementarysequence is effected according to standard conditions (e.g., in thepresent of chaotropic salts to balance T_(m) values of the varioushybrids). Any non-hybridized material can be washed off and thehybridized material analyzed.

In further embodiments, the methods herein use mixtures of the compoundsprovided herein that have permuted Q groups to achieve sorting of thebiomolecules following reaction with the compounds. These mixtures ofcompounds, in certain embodiments, have subsets (e.g., 64 or 256 or1024) of different X reagents out of the 4^(i) permutations in Q, wherei is the number of nucleotides or analogs thereof contained in the Bmoiety of Q (e.g., 65,536 permutations for i=8). Reaction of the subsetsseparately with an aliquot of the biomolecule mixture to be analyzedresults in conjugate mixtures that can be aligned with, e.g., amicrotiter plate format (e.g., 96, 384 1536, etc.). Analysis using thesesubsets of compound mixtures provides further sorting of thebiomolecules prior to analysis.

In other embodiments, selective pooling of the products of different Xmoiety-containing reagents (e.g., amino- and thiol-reactive X groups;antibody and amino-reactive X groups; antibody and lectin X groups,etc.) can be performed for combined analysis on a single assay (e.g., ona single chip).

FIG. 1 depicts an exemplary method for separation and analysis of acomplex mixture of proteins by use of MALDI-TOF mass spectrometry.Exposure of a compound as described herein, to a mixture ofbiomolecules, including, but not limited to, proteins (P1 to P4),affords a compound-protein array (NA=oligonucleotide moiety oroligonucleotide analog moiety, L=cleavable linker, P=protein).Separation of the array is effected by hybridization of the Q portion ofthe array to a complementary sequence attached to a support, such as anoligonucleotide chip. The proteins (P1 to P4) are then analyzed byMALDI-TOF mass spectrometry.

When the complexity of a mixture of biomolecules, including, but notlimited to, proteins, is low, affinity chromatographic or affinityfiltration methods can be applied to separate the compound-proteinproducts from the protein mixture. If the proteins to be analyzed werefluorescently labeled prior to (or after) reaction with the compound butprior to hybridization, these labeled proteins also can be detected onthe array. In this way the positions that carry a hybrid can be detectedprior to scanning over the array with MALDI-TOF mass spectrometry andthe time to analyze the array minimized. Mass spectrometers of variouskinds can be applied to analyze the proteins (e.g., linear or withreflection, with or without delayed extraction, with TOF, Q-TOFs orFourier Transform analyzer with lasers of different wavelengths and xysample stages).

Mass spectrometry formats for use herein, include, but are not limitedto, matrix assisted laser desorption ionization (MALDI), continuous orpulsed electrospray (ES) ionization, ionspray, thermospray, or massivecluster impact mass spectrometry and a detection format such as lineartime-of-flight (TOF), reflection time-of-flight, single quadruple,multiple quadruple, single magnetic sector, multiple magnetic sector,Fourier transform, ion cyclotron resonance (ICR), ion trap, andcombinations thereof such as MALDI-TOF spectrometry. For example, forES, the samples, dissolved in water or in a volatile buffer, areinjected either continuously or discontinuously into an atmosphericpressure ionization interface (API) and then mass analyzed by aquadrupole. The generation of multiple ion peaks that can be obtainedusing ES mass spectrometry can increase the accuracy of the massdetermination. Even more detailed information on the specific structurecan be obtained using an MS/MS quadrupole configuration.

Methods for performing MALDI are known to those of skill in the art.Numerous methods for improving resolution are also known. For example,resolution in MALDI TOF mass spectrometry can be improved by reducingthe number of high energy collisions during ion extraction (see, e.g.,Juhasz et al. (1996) Analysis, Anal. Chem. 68:941-946, see also, e.g.,U.S. Pat. Nos. 5,777,325, 5,742,049, 5,654,545, 5,641,959, and 5,760,393for descriptions of MALDI and delayed extraction protocols).Conditioning of molecules to be analyzed or of the capture-compoundbound biomolecules prior to analysis also can be employed.

In MALDI mass spectrometry (MALDI-MS), various mass analyzers can beused, e.g., magnetic sector/magnetic deflection instruments in single ortriple quadrupole mode (MS/MS), Fourier transform and time-of-flight(TOF), including orthogonal time-of-flight (O-TOF), configurations as isknown in the art of mass spectrometry. For the desorption/ionizationprocess, numerous matrix/laser combinations can be used. Ion-trap andreflection configurations also can be employed.

MALDI-MS requires the biomolecule to be incorporated into a matrix. Ithas been performed on polypeptides and on nucleic acids mixed in a solid(i.e., crystalline) matrix. The matrix is selected so that it absorbsthe laser radiation. In these methods, a laser, such as a UV or IRlaser, is used to strike the biomolecule/matrix mixture, which iscrystallized on a probe tip or other suitable support, thereby effectingdesorption and ionization of the biomolecule. In addition, MALDI-MS hasbeen performed on polypeptides, glycerol, and other liquids as a matrix.

A complex protein mixture can be selectively dissected, and in takingall data together, completely analyzed through the use of compounds withdifferent functionalities X. The proteins present in a mixture ofbiological origin can be detected because all proteins have reactivefunctionalities present on their surfaces. If at each position on thecompound-protein array, there is the same protein cleavable under thesame conditions as L or is added without covalent attachment to thesolid support and serving as an internal molecular weight standard, therelative amount of each protein (or peptide if the protein array wasenzymatically digested) can be determined. This process allows for thedetection of changes in expressed proteins when comparing tissues fromhealthy and disease individuals, or when comparing the same tissue underdifferent physiological conditions (e.g., time dependent studies). Theprocess also allows for the detection of changes in expressed proteinswhen comparing different sections of tissues (e.g., tumors), which canbe obtained, e.g., by laser biopsy.

Protein-protein interactions and protein-small molecule (e.g., drug)interactions can be studied by contacting the compound-protein arraywith a mixture of the molecules of interest. In this case, a compoundwill be used that has no cleavable linkage L, or that has a linkage Lthat is stable under MALDI-TOF MS conditions. Subsequent scanning of thearray with the mass spectrometer demonstrates that hybridized proteinsof the protein array have effectively interacted with the protein orsmall molecule mixtures of interest.

Analysis using the well known 2-hybrid methodology is also possible andcan be detected via mass spectrometry. See, e.g., U.S. Pat. Nos.5,512,473, 5,580,721, 5,580,736, 5,955,280, 5,695,941. See also, Brentet al. (1996) Nucleic Acids Res. 24(17):3341-3347.

In the above embodiments, including those where Z contains a cleavablelinkage, the compounds can contain a mass modifying tag. In theseembodiments, the mass modifying tag is used to analyze the differencesin structure (e.g., side chain modification such as phosphorylation ordephosphorylation) and/or expression levels of biomolecules, includingproteins. In one embodiment, two compounds (or two sets of compoundshaving identical permuted B moieties) are used that only differ in thepresence or absence of a mass modifying tag (or have two mass tags withappropriate mass differences). One compound (or one set of compounds) is(are) reacted with “healthy” tissue and the mass modified compound(s)are reacted with the “disease”tissue under otherwise identicalconditions. The two reactions are pooled and analyzed in a duplex mode.The mass differences will elucidate those proteins that are alteredstructurally or expressed in different quantity in the disease tissue.Three or more mass modifying tags can be used in separate reactions andpooled for multiplex analysis to follow the differences during differentstages of disease development (i.e., mass modifying tag 1 at time point1, mass modifying tag 2 at time point 2 etc.), or, alternatively, toanalyze different tissue sections of a disease tissue such as a tumorsample.

Selectivity in the reaction of the compounds provided herein with abiomolecule, such as a protein mixture also can be achieved byperforming the reactions under kinetic control and by withdrawingaliquots at different time intervals. Alternatively, different parallelreactions can be performed (for example, all differing in the B moietyof the Q group) and either performed with different stoichiometricratios or stopped at different time intervals and analyzed separately.

In embodiments where the capture compounds provided herein possess aluminescent or colorimetric group, the immobilized compound-biomoleculeconjugate can be viewed on the insoluble support prior to analysis.Viewing the conjugate provides information about where the conjugate hashybridized (such as for subsequent MALDI-TOF mass spectrometricanalysis). In certain embodiments, with selected reagents the quantityof a given protein from separate experiments (e.g., healthy vs. disease,time point 1 vs. time point 2, etc.) can be determined by using dyesthat can be spectrophotometrically differentiated.

In other embodiments, the methods are performed by tagging thebiomolecules to be analyzed, including but not limited to proteins, withmore than one, in one embodiment three to five, of the compoundsprovided herein. Such compounds possess functionality designed to targetsmaller chemical features of the biomolecules rather than amacromolecular feature. See, e.g., FIG. 3. Such smaller chemicalfeatures include, but are not limited to, NH₂, SH, SS (after capping SH,SS can be targeted by, e.g., gold), and OH. In one non-limiting example,the phenolic OH of tyrosine is selectively captured using a diazocompound, such as an aryldiazonium salt. In this embodiment, thereaction can be performed in water. For example, a functionalizeddiazonium salt could be used where the functionality allows forsubsequent capture of a compound provided herein, thereby providing aoligonucleotide-labelled biomolecule. One such functionalized diazoniumsalt is:

A biomolecule modified with this reagent is then labelled with anoligonucleotide possessing a diene residue. It is appreciated by thoseof skill in the art that many reagent couples other thatdienophile/diene can be used in these embodiments. In the case ofdienophile/diene, the reaction of the dienophile with the diene can beperformed in the presence of many other functional groups, includingN-hydroxysuccinimido-activated oligonucleotides reacting with an NH₂group. Thus, these two labelling specific reactions can be performed inone reaction. See, e.g., FIG. 5.

Subsequently, the multiply-tagged biomolecules are hybridized on anarray of antisense oligonucleotides, in one embodiment a chip containingan array of antisense oligonucleotides. Such multiply-taggedbiomolecules can be sorted with greater selectivity than singly taggedbiomolecules. See, e.g., FIG. 4.

In embodiments where the compounds for use in the methods providedherein are insoluble or poorly soluble in water or aqueous buffers,organic solvents are added to the buffers to improve solubility. In oneembodiment, the ratio of buffer:organic solvent is such thatdenaturation of the biomolecule does not occur. In another embodiment,the organic solvents used include, but are not limited to, acetonitrile,formamide and pyridine. In another embodiment, the ratio ofbuffer:organic solvent is about 4:1. To determine if an organicco-solvent is needed, the rate of reaction of the compounds providedherein with a water-soluble amine, such as 5′-aminothymidine, ismeasured. For example, the following reaction is performed is a varietyof solvent mixtures well known to those of skill in the art to determineoptimal conditions for subsequent biomolecule tagging and analysis:

2. Phenotype Analyses

The collections of capture permit a top down holistic approach toanalysis of the proteome and other biomolecules. As noted, thecollections and methods of use provide an unbiased way to analyzebiomolecules, since the methods do not necessarily assess specificclasses of targets, but rather detect or identify changes in thesamples. The changes identified include structural changes that arerelated to the primary sequences and modifications, includingpost-translational modifications. In addition, since the capturecompounds can include a solubility function they can be designed forreaction in hydrophobic conditions, thereby permitting analysis ofmembrane-bound and membrane-associated molecules, particularly proteins.

Problems with proteome analysis arise from genetic variation that is notrelated to a target phenotype, proteome variation due to differences,such as gender, age, metabolic state, the complex mixtures of cells intarget tissues and variations from cell cycle stage. Thus, to identifyor detect changes, such as disease-related changes, among thebiomolecule components of tissues and cells, homogeneity of the samplecan be important. To provide homogeneity, cells, with differentphenotypes, such as diseased versus healthy, from the same individualare compared. As a result, differences in patterns of biomolecules canbe attributed to the differences in the phenotype rather than fromdifferences among individuals. Hence, samples can be obtained from asingle individual and cells with different phenotypes, such as healthyversus diseased and responders versus non-responders, are separated. Inaddition, the cells can be synchronized or frozen into a metabolic stateto further reduce background differences.

Thus, the collections of capture compounds can be used to identifyphenotype-specific proteins or modifications thereof or otherphenotype-specific biomolecules and patterns thereof. This can beachieved by comparing biomolecule samples from cells or tissues with onephenotype to the equivalent cells to biomolecule samples from cells ortissues with another phenotype. Phenotypes in cells from the sameindividual and cell type are compared. In particular, primary cells,primary cell culture and/or synchronized cells are compared. Thepatterns of binding of biomolecules from the cells to capture compoundmembers of the collection can be identified and used as a signature orprofile of a disease or healthy state or other phenotypes. Theparticular bound biomolecule, such as proteins, also can be identified,and new disease-associated markers, such as particular proteins orstructures thereof, can be identified. Example 6 provides an exemplaryembodiment in which cells are separated. See also FIG. 19.

Phenotypes for comparison include, but are not limited to:

1) samples from diseased versus healthy cells or tissues to identifyproteins or other biomolecules associated with disease or that aremarkers for disease;

2) samples from drug responders and non responders (i.e. on 20-30% ofmalignant melanoma patients respond to alpha interferon and others to donot) to identify biomolecules indicative of response;

3) samples from cells or tissues with a toxicity profile to drugs orenvironmental conditions to identify biomolecules associated with theresponse or a marker of the response; and

4) samples from cells or tissues exposed to any condition or exhibitingany phenotype in order to identify biomolecules, such as proteins,associated with the response or phenotype or that are a marker therefor.

Generally the samples for each phenotype are obtained from the sameorganism, such as from the same mammal so that the cells are essentiallymatched and any variation should reflect variation due to the phenotypenot the source of the cells. Samples can be obtained from primary cells(or tissues). In all instances, the samples can be obtained from thesame individual either before exposure or treatment or from healthynon-diseased tissue in order to permit identification ofphenotype-associated biomolecules.

Cells can be separated by any suitable method that permitsidentification of a particular phenotype and then separation of thecells based thereon. Any separation method, such as, for example,panning, negative panning (where unwanted cells are captured and thewanted cells remain in the supernatant where the live cells arerecovered) can be used. These methods include, but are not limited to:

1) flow cytometry;

2) specific capture;

3) negative panning in which unwanted cells are captured and thetargeted cells remain in the supernatant and live cells are recoveredfor analysis; and

4) Laser Capture Microdissection (LCM) (Arcturus, Inc Mountain View,Calif.).

Thus sorting criteria include, but are not limited to, membranepotential, ion flux, enzymatic activity, cell surface markers, diseasemarkers, and other such criteria that permit separation of cells from anindividual based on phenotype.

a) Exemplary Separation Methods

1) Laser Capture Microdissection

Laser Capture Microdissection (LCM) (Arcturus, Inc Mountain View,Calif.) uses a microscope platform combined with a low-energy IR laserto activate a plastic capture film onto selected cells of interest. Thecells are then gently lifted from the surrounding tissue. This approachprecludes any absorption of laser radiation by microdissected cells orsurrounding tissue, thus ensuring the integrity of RNA, DNA, and proteinprepared from the microdissected samples for downstream analysis.

2) Flow Cytometry for Separation

Flow cytometry is a method, somewhat analogous to fluorescentmicroscopy, in which measurements are performed on particles (cells) inliquid suspension, which flow one at a time through a focused laser beamat rates up to several thousand particles per second. Light scatteredand fluorescence emitted by the particles (cells) is collected,filtered, digitized and sent to a computer for analysis. Typically flowcytometry measures the binding of a fluorochrome-labeled probe to cellsand the comparison of the resultant fluorescence to the backgroundfluorescence of unstained cells. Cells can be separated using a versionof flow cytometry, flow sorting, in which the particles (cells) areseparated and recovered from suspension based upon properties measuredin flow. Cells that are recovered via flow sorting are viable and can becollected under sterile conditions. Typically recovered subpopulationsare in excess of 99.5% pure (see FIGS. 19 a and 19 b).

Flow cytometry allows cells to be distinguished using various parametersincluding physical and/or chemical characteristics associated with cellsor properties of cell-associated reagents or probes, any of which aremeasured by instrument sensors. Separation: live v. dead forward andside scatter are used for preliminary identification and gating of cellpopulations. Scatter parameters are used to exclude debris, dead cells,and unwanted aggregates. In a peripheral blood or bone marrow sample,lymphocyte, monocyte and granulocyte populations can be defined, andseparately gated and analyzed, on the basis of forward and side scatter.Cells that are recovered via flow sorting are viable and can becollected under sterile conditions. Typically recovered subpopulationsare in excess of 99.5% pure.

Common cell sorting experiments usually involve immunofluorescenceassays, i.e., staining of cells with antibodies conjugated tofluorescent dyes in order to detect antigens. In addition, sorting canbe performed using GFP-reporter constructs in order to isolate purepopulations of cells expressing a given gene/construct.

a. Fluorescence

Fluorescent parameter measurement permits investigation of cellstructures and functions based upon direct staining, reactions withfluorochrome labeled probes (e.g., antibodies), or expression offluorescent proteins. Fluorescence signals can be measured as single ormultiple parameters corresponding to different laser excitation andfluorescence emission wavelengths. When different fluorochromes are usedsimultaneously, signal spillover can occur between fluorescencechannels. This is corrected through compensation. Certain combinationsof fluorochromes cannot be used simultaneously; those of skill in theart can identify such combinations.

b. Immunofluorescence

Immunofluorescence involves the staining of cells with antibodiesconjugated to fluorescent dyes such as FITC (fluorescein), PE(phycoerythrin), APC (allophycocyanin), and PE-based tandem conjugates(R670, CyChrome and others.). Cell surface antigens are the usualtargets of this assay, but antibodies can be directed at antigens orcytokines in the cytoplasm as well.

DNA staining is used primarily for cell cycle profiling, or as onemethod for measuring apoptosis. Propidium iodide (PI), the most commonlyused DNA stain, cannot enter live cells and can therefore be used forviability assays. For cell cycle or apoptosis assays using PI, cellsmust first be fixed in order for staining to take place (see protocol).The relative quantity of PI-DNA staining corresponds to the proportionof cells in G0/G1, S, and G2/M phases, with lesser amounts of stainingindicating apoptotic/necrotic cells. PI staining can be performedsimultaneously with certain fluorochromes, such as FITC and GFP, inassays to further characterize apoptosis or gene expression.

Gene expression and transfection can be measured indirectly by using areporter gene in the construct. Green Fluorescent Protein-typeconstructs (EGFP, red and blue fluorescent proteins) andβ-galactosidase, for example, can be used to quantify populations ofthose cells expressing the gene/construct. Mutants of GFP are nowavailable that can be excited at common frequencies, but emitfluorescence at different wavelengths. This allows for measurement ofco-transfection, as well as simultaneous detection of gene and antibodyexpression. Appropriate negative (background) controls for experimentsinvolving GFP-type constructs should be included. Controls include, forexample, the same cell type, using the gene insert minus the GFP-typeconstruct.

3) Metabolic Studies and Other Studies

Annexin-V can be labeled with various fluorochromes in order to identifycells in early stages of apoptosis. CFSE binds to cell membranes and isequally distributed when cells divide. The number of divisions cellsundergo in a period of time can then be counted. CFSE can be used inconjunction with certain fluorochromes for immunofluorescence. Calciumflux can be measured using Indo-1 markers. This can be combined withimmunofluorescent staining. Intercellular conjugation assays can beperformed using combinations of dyes such as calcein or hydroethidine.

b) Synchronizing Cell Cycles

Once sorted or separated cells are obtained they can be cultured, and,can be synchronized or frozen into a particular metabolic state. Thisenhances the ability to identify phenotype-specific biomolecules. Suchcells can be separated by the above methods, including by flowcytometry. Further, cells in the same cell cycle, same metabolic stateor other synchronized state can be separated into groups using flowcytometry (see, FIG. 19 c).

Cell cycles can be synchronized or frozen by a variety of methods,including but are not limited to, cell chelation of critical ions, suchas by removal of magnesium, zinc, manganese, cobalt and/or other ionsthat perform specific functions by EDTA or other chelators (see, e.g.,EXAMPLES). Other methods include controlling various metabolic orbiochemical pathways. FIG. 18 depicts exemplary points of regulation ofmetabolic control mechanisms for cell synchronization. Examples ofsynchronizing or “freezing” metabolic control for synchronizing cells,include, but are not limited to, the following:

1) control of gene expression;

2) regulation of enzyme reactions;

3) negative control: Feedback inhibition or End product repression andenzyme induction are mechanisms of negative control that lead to adecrease in the transcription of proteins;

4) positive control: catabolite repression is considered a form ofpositive control because it affects an increase in transcription ofproteins.

5) Control of individual proteins translation:

-   -   a) oligonucleotides that hybridize to the 5′ cap site inhibit        protein synthesis by inhibiting the initial interaction between        the mRNA and the ribosome 40S sub-unit;    -   b) oligonucleotides that hybridize to the 5′ UTR up to, and        including, the translation initiation codon inhibit the scanning        of the 40S (or 30S) subunit or assembly of the full ribosome        (80S for eukaryotes or 70S for bacterial systems);

6) control of post translational modification:

7) control of allosteric enzymes, where the active site binds to thesubstrate of the enzyme and converts it to a product. The allostericsite is occupied by some small molecule that is not a substrate. If theprotein is an enzyme, when the allosteric site is occupied, the enzymeis inactive, i.e., the effector molecule decreases the activity of theenzyme. Some multicomponent allosteric enzymes have several sitesoccupied by various effector molecules that modulate enzyme activityover a range of conditions.

3. Analysis of Low Abundancy Proteins

Important disease-associated markers and targets could be low abundancyproteins, that might not be detected by mass spectrometry. To ensuredetection, a first capture compound display experiment can be performed.The resulting array of captured proteins is reacted with a non-selectivedye, such as a fluorescent dye, that will light up or render visiblemore proteins on the array. The dye can provide a semi-quantitativeestimate of the amount of a protein. The number of different proteinsdetected by the dye can be determined and then compared to the numberdetected by mass spectrometric analysis. If there are more proteinsdetected using the dye, the experiments can be repeated using a higherstarting number of cells so that low abundance proteins can be detectedand identified by the mass spectrometric analysis.

For example, housekeeping proteins, such as actin and other suchproteins, are present in high abundance and can mask low abundancyproteins. Capture compounds or other purification compound selected ordesigned to capture or remove the high abundancy proteins orbiomolecules from a mixture before using a collection to assess thecomponents of the mixture. Once the high abundancy proteins are removed,low abundancy proteins have an effectively higher concentration and canbe detected. These methods, thus, have two steps: a first step tocapture high abundancy components of biomolecule mixtures, such as theactins. For example, a cell lysate can be contacted with capturemolecules that include a reactivity group such as biotin or othergeneral reactivity function linked to a sorting group to remove suchhigh abundancy proteins, and then use a suitable collection of capturecompounds to identify lower abundancy compounds remaining in the lysate.

Also, as discussed above, capture compounds can be designed, such as byappropriate selection of W, to interact intact with intact organellesbefore disrupting them in cells that have been gently lysed or otherwisetreated to permit access to organelles and internal membranes. Then thecaptured organelles can be disrupted, such as on which can include anartificial membrane, such as lipid bilayer or micelle coating, tocapture the organelle proteins and other biomolecules in an environmentthat retains their three-dimensional structure. These captured proteinscan be analyzed. This permits the capture compounds to interact with thecaptured proteins and other biomolecules in their native tertiarystructure.

4. Monitoring Protein Conformation as an Indicator of Disease

The collections and/or members thereof can be used to detect ordistinguish specific conformers of proteins. Hence, for example, if aparticular conformation of a protein is associated with a disease (orhealthy state) the collections or members thereof can detect oneconformer or distinguish conformers based upon a pattern of binding tothe capture compounds in a collection. Thus, the collections and/ormembers thereof can be used to detect conformationally altered proteindiseases (or diseases of protein aggregation), where adisease-associated protein or polypeptide has a disease-associatedconformation. The methods and collections provided herein permitdetection of a conformer associated with a disease to be detected. Thesediseases include, but are not limited to, amyloid diseases andneurodegenerative diseases. Other diseases and associated proteins thatexhibit two or more different conformations in which at least oneconformation is associated with disease, include those set forth in thefollowing Table:

Disease Insoluble protein Alzheimer's Disease (AD) APP, Aα,α1-antichymotrypsin, tau, non-Aα component, presenellin 1, presenellin2, apoE Prion diseases, including but are not PrP^(Sc) limited to,Creutzfeldt-Jakob disease, scrapie, bovine spongiform encephalopathyamyotrophic lateral sclerosis (ALS) superoxide dismutase (SOD) andneurofilament Pick's Disease Pick body Parkinson's disease α-synucleinin Lewy bodies Frontotemporal dementia tau in fibrils Diabetes Type IIamylin Multiple myeloma IgGL-chain Plasma cell dyscrasias Familialamyloidotic Transthyretin polynueuropathy Medullary carcinoma of thyroidProcalcitonin Chronic renal failure β₂-microgobulin Congestive heartfailure Atrial natriuretic factor Senile Cardiac and systemictransthyretin amyloidosis Chronic inflammation Serum Amyloid AAtherosclerosis ApoAI Familial amyloidosis Gelsolin Huntington's diseaseHuntington

The collections can be contacted with a mixture of the conformers andthe members that bind or retain each form can be identified, and apattern thus associated with each conformer. Alternatively, those thatbind to only one conformer, such as the conformer associated withdisease can be identified, and sub-collections of one or more of suchcapture compounds can be used as a diagnostic reagent for the disease.

5. Small Molecule Identification and Biomolecule-Biomolecule InteractionInvestigation

Biomolecules, such as proteins, are sorted using a covalent ornoncovalent interaction with immobilized capture compounds. Collections,such as arrays of capture compounds bound to biomolecules, such as fromcell lysates, then can be used to screen libraries or other mixtures ofdrug candidates or to further screen mixtures of biomolecules to seewhat binds to the bound biomolecules. The capturebiomolecule-biomolecule complexes or biomolecule-drug candidatecomplexes can be analyzed to identify biochemical pathways and also toidentify targets with the candidate drug.

For example, protein-protein or protein-biomolecule interactions areexposed to test compounds, typically small molecules, including smallorganic molecules, peptides, peptide mimetics, antisense molecules ordsRNA, antibodies, fragments of antibodies, recombinant and syntheticantibodies and fragments thereof and other such compounds that can serveas drug candidates or lead compounds. Bound small molecules areidentified by mass spectrometry or other analytical methods.

F. Systems

In further embodiments, the compounds and the methods described hereinare designed to be placed into an integrated system that standardizesand automates the following process steps:

-   -   Isolation of biomolecules from a biological source, including        isolation of the proteins from cell lysates (lysis, enzymatic        digestion, precipitation, washing)    -   Optionally, removal of low molecular weight materials    -   Optionally, aliquoting the biomolecule mixture, such as a        protein mixture    -   Reaction of the biomolecule mixture, such as a protein mixture,        with compounds of different chemical reactivity (X) and sequence        diversity (B) provided herein; this step can be performed in        parallel using aliquots of the biomolecule mixture    -   Optionally, removal of excess compound    -   Hybridization of the compound-biomolecule conjugate, such as a        compound-protein conjugate to single stranded oligonucleotides        or oligonucleotide analogs that are complementary to the Q        moiety of the compound; the single stranded oligonucleotides or        oligonucleotide analogs are optionally presented in an array        format and are optionally immobilized on an insoluble support    -   Optionally, subsequent chemical or enzymatic treatment of the        protein array    -   Analysis of the biomolecule array, including, but not limited        to, the steps of (i) deposition of matrix, and (ii) spot-by-spot        MALDI-TOF mass spectrometry using an array mass spectrometer        (with or without internal, e.g., on-chip molecular weight        standard for calibration and quantitation).

The system includes the collections provided herein, optionally arraysof such collections, software for control of the processes of samplepreparation and instrumental analysis and for analysis of the resultingdata, and instrumentation, such as a mass spectrometer, for analysis ofthe biomolecules. The system includes other devices, such as liquidchromatographic devices so that a protein mixture is at least partiallyseparated. The eluent is collected in a continuous series of aliquotsinto, e.g., microtiter plates, and each aliquot reacted with a capturecompound provided.

In multiplex reactions, aliquots in each well can simultaneously reactwith one or more of the capture compounds provided herein that, forexample each differ in X (i.e., amino, thiol, lectin specificfunctionality) with each having a specific and differentiatingselectivity moiety Y and in the Q group. Chromatography can be done inaqueous or in organic medium. The resulting reaction mixtures are pooledand analyzed directly. Alternatively, subsequent secondary reactions ormolecular interaction studies are performed prior to analysis, includingmass spectrometric analysis.

The systems provided herein can contain an assembly line, such aspipetting robots on xy stages and reagent supply/washing modules thatare linked with a central separation device and a terminal massspectrometer for analysis and data interpretation. The systems can beprogrammed to perform process steps including (see, e.g., FIG. 2), forexample:

-   -   1) Cell cultures (or tissue samples) are provided in microtiter        plates (MTPs) with 1, 2 . . . i wells. To each well, solutions        are added for lysis of cells, thereby liberating the proteins.        In some embodiments, appropriate washing steps are included, as        well as addition of enzymes to digest nucleic acids and other        non-protein components. In further embodiments, instead of        regular MTPs, MTPs with filter plates in the bottom of wells are        used. Cell debris is removed either by filtration or        centrifugation. A conditioning solution for the appropriate        separation process is added and the material from each well        separately loaded onto the separation device.    -   2) Separation utilizes different separation principles such as        charge, molecular sizing, adsorption, ion-exchange, and        molecular exclusion principles. Depending on the sample size,        suitable appropriate dimensions are utilized, such as microbore        high performance liquid chromatography (HPLC). In certain        embodiments, a continuous flow process is used and the effluent        is continuously aliquotted into MTP 1, 2 . . . n.    -   3) Reaction with Proteome Reagents. Each MTP in turn is        transferred to a Proteome Reagent Station harboring 1, 2 . . . m        reagents differing only in the oligonucleotide sequence part        (i.e., Q) or/and in the chemical nature of the functionality        reacting with the proteins (i.e., X). If there are more than one        MTP coming from one tissue sample then reagent 1 is added to the        same well of the respective MTPs 1, 2 . . . n, i.e., in well A1,        reagent 2 in well A2, etc. In embodiments where the MTPs have 96        wells (i=1-96), 96 different Proteome Reagents (i.e., 96        different compounds provided herein, m=1-96) are supplied        through 96 different nozzles from the Proteome Reagent Station        to prevent cross-contamination.    -   4) Pooling: Excess Proteome Reagent is deactivated, aliquots        from each well belonging to one and the same tissue samples are        pooled, and the remaining material is stored at conditions that        preserve the structure (and if necessary conformation) of the        proteins intact, thereby serving as master MTPs for subsequent        experiments.    -   5) Excess Proteome Reagent is removed in the pooled sample        using, e.g., the biotin/streptavidin system with magnetic beads,        then the supernatant is concentrated and conditioned for        hybridization.    -   6) Transfer to an Oligonucleotide Chip. After a washing step to        remove non-hybridized and other low molecular weight material, a        matrix is added. Alternatively, before matrix addition, a        digestion with, e.g., trypsin or/and chymotrypsin is performed.        After washing out the enzyme and the digestion products, the        matrix is added.    -   7) Transfer of chip to mass spectrometer. In one embodiment,        MALDI-TOF mass spectrometry is performed. Other mass        spectrometric configurations suitable for protein analysis also        can be applied. The mass spectrometer has a xy stage and thereby        rasters over each position on the spot for analysis. The        Proteome Reagent can be designed so that most of the reagent        part (including the part hybridizing with the oligonucleotide        chip array) is cleaved either before or during mass spectrometry        and therefore will be detected in the low molecular weight area        of the spectrum and therefore will be well separated from the        peptide (in case of enzymatic digestion) or protein molecular        weight signals in the mass spectrum.    -   8) Finally, the molecular weight signals can be processed for        noise reduction, background subtraction and other such        processing steps. The data obtained can be archived and        interpreted. The molecular weight values of the proteins (or the        peptides obtained after enzymatic digestion) are associated with        the human DNA sequence information and the derived protein        sequence information from the protein coding regions. An        interaction with available databases will reveal whether the        proteins and their functions are already known. If the function        is unknown, the protein can be expressed from the known DNA        sequence in sufficient scale using standard methods to elucidate        its function and subsequent location in a biochemical pathway,        where it plays its metabolic role in a healthy individual or in        the disease pathway for an individual with disease.

Since the master plates containing aliquots from the different proteinswithin a given tissue sample have been stored and are available,subsequent experiments then can be performed in a now preselected way,e.g., the proteins are displayed on the chip surface for protein-protein(biomolecule) interaction studies for target validation or/and to studythe interaction with combinatorial libraries of small molecules for drugcandidate selection.

G. Bioinformatics

The raw data generated from the analysis, such as mass spectrometryanalysis, of the compound-protein species is processed by backgroundsubtraction, noise reduction, molecular weight calibration and peakrefinement (e.g., peak integration). The molecular weight values of thecleaved proteins or the digestion products are interpreted and comparedwith existing protein databases to determine whether the protein inquestion is known, and if so, what modifications are present(glycosylated or not glycosylated, phosphorylated or not phosphorylated,etc.). The different sets of experiments belonging to one set ofcompounds are composed, compared and interpreted. For example, one setof experiments uses a set of compounds with one X moiety and different Qmoieties. This set of experiments provides data for a portion of theproteome, since not all proteins in the proteome will react with a givenX moiety. Superposition of the data from this set of experiments withdata from other sets of experiments with different X moieties providesdata for the complete proteome.

Sets of experiments comparing tissues of healthy and disease individualsor from different physiological or developmental stages (e.g., tumorprogression, dependence of drug treatments to monitor result of therapy,immune response to virus or bacteria infection) or different tissueareas (e.g., of a tumor) are investigated, and the final data archived.

The following examples are included for illustrative purposes only andare not intended to limit the scope of the invention.

Commercial grade solvents and reagents were used without purificationunless otherwise specified, and were purchased from the followingvendors: Anhydrous THF (Aldrich), CH₂Cl₂ (Aldrich, Acros, EM Science),CHCl₃ (Aldrich, Mallinckrodt), Hexanes (Acros, EM science), Ethylacetate (Aldrich, Acros), Acetone (Aldrich, EM science), Methyl alcohol(Aldrich), Diethyl ether (Fisher scientific). 4-Bromobenzoic acid(Aldrich), 2-amino-2-methyl-1-propanol (Acros), 1,3-dicyclocarbodiimide(Aldrich), N-hydroxysuccinimide (Aldrich), Maleimide (Aldrich),1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (Acros),Thionyl chloride (Aldrich), Pyridine (Aldrich), Magnesium turnings(Acros), 4-(Diphenylhydroxymethyl)benzoic acid (Fluka), Sodium ethoxide(Acros), Potassium carbonate, Sodium iodide, Carbon tetrachloride,methyl iodide, RED-Al (Aldrich), anhydrous Na₂SO₄ (Acros), Acetic acid(EM science), Sodium hydroxide (Acros), Molecular sieves A^(o) ₄(Aldrich), and Acetyl chloride (Aldrich). ¹H NMR spectral data wereobtained from a 500 MHz NMR spectraphotometer using CDCl₃ as a solvent.Mass spectral data were analyzed using the electrospray method.

EXAMPLE 1 Examples for N¹ _(m)B_(i)N² _(n)

a. N¹ and N² as Identical Tetramers, B as a Trimer

N¹=N², m=n=4, i=3, B=64 sequence permutations (SEQ ID. NO: 150)

GTGC ATG GTGC AAG ACG AGG TTG CTG GTG ... ... ... GGG

b. N¹ and N² as Non-Identical Tetramers, B as a Tetramer

N¹≠N², m=n=4, i=4, B=256 sequence permutations (SEQ ID. NO: 151)

GTCC ATCG CTAC AACG ACCG AGCG .... .... .... GGGG

c. N¹ as a Heptamer, N² as an Octamer, B as an Octamer

N¹≠N², m=7, n=8, i=8, B=65,536 sequence permutations. (SEQ ID. NO: 152).

GCTGCCC ATTCGTAC GCCTGCCC   N¹      B        N²

EXAMPLE 2 Separation of Proteins on a DNA Array

-   N¹ _(m)B_(i)N² _(n)(S¹)_(t)M(R¹⁵)_(a)(S²)_(b)LXProtein where B is a    trimer;-   m=n=4, i=3, t=b=1; underlined sequences are N¹ and N²

   (SEQ ID NO: 153) / |    CTGC ATG GTGC-S₁-M(R¹⁵)_(a)-S₂-L-X-Protein 1/ | ---CACG TAC CACG / | / |    CTGC AAGGTGC-S₁-M(R¹⁵)_(a)-S₂-L-X-Protein 2 / | ---CACG TTC CACG / | / |   CTGC ACG GTGC-S₁-M(R¹⁵)_(a)-S₂-L-X-Protein 3 / | ---CACG TGC CACG / |/ |         ... / | / |         ... / | / |         ... / | / |   CTGC GGG GTGC-S₁-M(R¹⁵)_(a)-S₂-L-X-Protein 64 / | ---CACG CCC CACG   (SEQ ID NO: 154)

EXAMPLE 3 I. Preparation of Protein Mixtures from Cells or Via ProteinTranslation of a cDNA Library Prepared from Cells or Tissues

The protein mixtures can be selectively divided on the physical orbiochemical separation techniques

1. Preparation of Limited Complexity Protein Pools Using Cell Culture orTissue

Proteins can be isolated from cell culture or tissues according tomethods well known to those of skill in the art. The isolated proteinsare purified using methods well known to those of skill in the art(e.g., TPAE, differential protein precipitation (precipitation by salts,pH, and ionic polymers), differential protein crystallization bulkfractionation, electrophoresis (PAGE, isoelectric focusing, capillary),and chromatography (immunoaffinity, HPLC, LC)). Individual columnfractions containing protein mixtures of limited complexity arecollected for use as antigen.

2. Preparation of Limited Complexity Protein Pools Using cDNA ExpressionLibraries (FIG. 6)

a. RNA Isolation

i. Isolation of Total RNA

Cultured cells or tissues are homogenized in a denaturing solutioncontaining 4

M guanidine thiocyanate. The homogenate is mixed sequentially with 2 Msodium acetate (pH 4), phenol, and finally chloroform/isoamyl alcohol orbromochloropropane. The resulting mixture is centrifuged, yielding anupper aqueous phase containing total RNA. Following isopropanolprecipitation, the RNA pellet is dissolved in denaturing solution(containing 4 M guanidine thiocyanate), precipitated with isopropanol,and washed with 75% ethanol.

ii. Isolation of Cytoplasmic RNA

Cells are washed with ice-cold phosphate-buffered saline and kept on icefor all subsequent manipulations. The pellet of harvested cells isresuspended in a lysis buffer containing the nonionic detergent NonidetP-40. Lysis of the plasma membranes occurs almost immediately. Theintact nuclei are removed by a brief micro-centrifuge spin, and sodiumdodecyl sulfate is added to the cytoplasmic supernatant to denatureprotein. Protein is digested with protease and removed by extractionswith phenol/chloroform and chloroform. The cytoplasmic RNA is recoveredby ethanol precipitation.

b. mRNA Purification

Messenger RNA is purified from total or cytoplasmic RNA preparationusing standard procedures. Poly(A)⁺ RNA can be separated from total RNAby oligo (dT) binding to the Poly(A) tail of the mRNA. Total RNA isdenatured to expose the Poly(A) (polyadenylated) tails.Poly(A)-containing RNA is then bound to magnetic beads coated witholigo(dT) and spirited from the total or cytoplasmic RNA throughmagnetic forces. The mRNA population can be further enriched for thepresence of full-length molecules through the selection of a 5′-capcontaining mRNA species.

c. cDNA Synthesis

Different types of primers can be used to synthesis full length or5′-end containing cDNA libraries from the isolated mRNA.

i. Oligo (dT) Primer, which Will Generate cDNAs for all mRNA Species(FIG. 7)

An example of the production of an adapted oligo dT primed cDNA libraryis provided in FIG. 7.

ii. Functional Protein Motif Specific Degenerate Oligonucleotide PrimersWill Generate a Limited Number of Genes Belonging to the Same ProteinFamily or of Functionally Related Proteins (FIG. 8)

An example of the production of an adapted sequence motif specific cDNAlibrary is provided in FIG. 8.

iii. Gene Specific Oligonucleotide Will Produce cDNA for only one mRNASpecies (FIG. 9)

The oligonucleotides used for the cDNA production can contain additionalsequences, 1) protein tag specific sequences for easier purification ofthe recombinant proteins (6×His), 2) restriction enzyme sites, 3)modified 5′-end for cDNA purification or DNA construction purposes (FIG.10).

The conversion of mRNA into double-stranded cDNA for insertion into avector is carried out in two parts. First, intact mRNA hybridized to anoligonucleotide primer, is copied by reverse transcriptase and theproducts isolated by phenol extraction and ethanol precipitation. TheRNA in the RNA-DNA hybrid is removed with RNase H as E. coli DNApolymerase I fills in the gaps. The second-strand fragments thusproduced are ligated by E. coli DNA ligase. Second-strand synthesis iscompleted, residual RNA degraded, and cDNA made blunt with RNase H,RNase A, T4 DNA polymerase, and E. coli DNA ligase.

d. Adapter Ligation

Adapter molecules can be ligated to both ends of the blunt ended doublestranded cDNA or to only one end of the cDNA. Site directed adapterligation could be achieved through the use of 5′ modifiedoligonucleotides (for example biotinylated, aminated) during cDNAsynthesis that prevents adapter ligation to the 3′ end of the cDNA. Theresulting cDNA molecules contain a 5′-end cDNA library comprised of the5′ non-translated region, the translational start codon AUG coding for amethionine, followed by the coding region of the gene or genes. The cDNAmolecules are flanked by known DNA sequence on their 5′- and 3′-ends(FIGS. 14, 15 and 16).

e. cDNA Amplification

PCR primers to the known 5′- and 3′-end sequences or known internalsequences can be synthesized and used for the amplification of eitherthe complete library or specific subpopulations of cDNA using anextended 5′- or 3′-amplification primer in combination with the primerlocated on the opposite site of the cDNA molecules (FIG. 11).

f. Primer Design for the Amplification of Gene Sub-Populations

The sub-population primers contain two portions (FIG. 12). The 5′-partof the primer is complementary to the sequence of a known sequence,extending with its 3′-end into the unknown cDNA sequence. Since eachnucleotide in the cDNA part of the library can have an adenosine,cytidine, guanosine or thymidine residue, 4 different nucleotidespossibilities exist for each nucleotide position. Four differentamplification primers can be synthesized, each containing the same knownsequence and extending by one nucleotide into the cDNA area of thelibrary. The 4 primers only differ at their most 3′-nucleotide, beingeither A, C, G or T. If we suppose that each nucleotide (A, C, G, T) isequally represented in a stretch of DNA, each one of the 4 amplificationprimers will amplify one quarter of the total genes represented in thecDNA library. Extending the amplification primer sequence further andincreasing the number of amplification primers, the complexity of theamplification products can be further reduced. Extending the sequence by2 nucleotides requires the synthesis of 16 different primers decreasingthe complexity by 16 fold, 3 nucleotides require 64 different primersand nucleotide extension requires n⁴ different primers.

g. PCR Amplification

PCR amplification entails mixing template DNA, two appropriateoligonucleotide primers (5′- and 3′-end primers located in the knownadded sequences directed in complementary orientation), Taq or otherthermostable DNA polymerases, deoxyribonucleoside triphosphates (dNTPs),and a buffer. The PCR products are analyzed after cycling on DNA gels orthrough analysis on an ABI 377 using the genescan analysis software.These analysis methods allow the determination of the complexity of theamplified cDNA pool.

h. Production of a Protein Expression Library

Each amplified cDNA library sub-population is cloned 5′ to 3′ in abacterial (E. coli, etc.) or eukaryotic (baculovirus, yeast, mammalian)protein expression system. The gene is introduced with its owntranslational initiation signal and a 6×His tag in all 3 frames. Forexample: the cDNA is restricted with two different, rare-cuttingrestriction enzymes (5′-end BgIII and 3′-end Not I) and cloned in the 5′to 3′orientation in the Baculovirus transfer vector pVL1393 under thedirect control of the polyhedra promoter.

i. Protein Expression

Linearized baculovirus DNA and recombinant transfer-vector DNA arecotransfected into susceptible Sf9 insect cells with calcium phosphate.For cotransfection, 10 ug of purified plasmid DNA is prepared. Aninitial recombinant baculovirus stock is prepared and Sf9 cells areinfected for recombinant protein production.

j. Protein Purification

The expressed recombinant proteins contain an affinity tag (an exampleis a 6×His tag). They are purified on Ni-NTA agarose. Approximately 1 to2 mg of 6×His recombinant fusion protein is routinely obtained per literof insect cell culture.

k. Purification Tag Removal

If the expression vector or the amplification primer was constructedwith a proteolytic cleavage site for thrombin, the purification tag canbe removed from the recombinant proteins after the protein affinitypurification step.

II. Antibody Generation by Immunization of Different Animals withIndividual Protein Mixtures

3. Preparation of Antibody Protein Capture Reagents

A purified protein preparation translated from a pool of cDNAs isinjected intramuscularly, intradermally, or subcutaneously in thepresence of adjuvant into an animal of the chosen species (rabbit).Booster immunizations are started 4 to 8 weeks after the primingimmunization and continued at 2- to 3-week intervals. The polyclonalantiserum is purified using standards known to those skilled in the art.

The purified antibody batches can be used directly as protein capturereagents without modification. In this case the antibody batches fromdifferent animals have to be kept separate (each batch is one capturereagent).

III. Antibody Proteins are Isolated and Conjugated with Nucleic AcidSequences that Correspond to the Original Antigen Preparation Resultingin the Antibody Capture Reagents

Generation of bi-functional capture/sorting molecules for sorting of thecomplex protein mixture on a solid phase.

The glycosylated C_(H) ² domain of the polyclonal antibodies areconjugation to 5′modified oligonucleotides using standard conjugationmethods. The resulting molecule has one protein capture moiety(antibody) and one nucleic acid moiety (oligonucleotide) (FIG. 13).

The antibody batches after immunization of an animal with a reducedcomplexity protein pool are conjugated with the one oligonucleotidesequence. Antibodies produced from multiple immunization events withdifferent protein pools are conjugated to an oligonucleotide with adifferent sequence (FIG. 13).

4. Capture of Target Proteins Using Reactivity, Functionality andSorting by Oligonucleotide Hybridization

Two different methods have been developed for making oligonucleotidesbound to a solid support: they can be synthesized in situ, orpresynthesized and attached to the support. In either case, it ispossible to use the support-bound oligonucleotides in a hybridizationreaction with oligonucleotides in the liquid phase to form duplexes; theexcess of oligonucleotide in solution can then be washed away.

The support can take the form of particles, for example, glass spheres,or magnetic beads. In this case the reactions could be carried out intubes, or in the wells of a microtitre plate. Methods for synthesizingoligonucleotides and for attaching presynthesized oligonucleotides tothese materials are known (see, e.g., Stahl et al. (1988) Nucleic AcidsResearch 16(7):3025-3039).

a. Preparation of Amine-Functionalized Solid Support

Oligonucleotides of a defined sequence are synthesized on anamine-functionalized glass support. An amine function was attached atdiscrete locations on the glass slide using a solution of 700 μl ofH₂N(CH₂)₃Si(OCH₂CH₃)₃ in 10 ml of 95% ethanol at room temperature for 3hours. The treated support is washed once with methanol and then oncewith ethyl ether. The support was dried at room temperature and thenbaked at 110° C. for 15 hours. It was then washed with water, methanoland water, and then dried.

The glass slide was reacted for 30 minutes at room temperature with 250mg (1 millimole) of phthallic anhydride in the presence of 2 ml ofanhydrous pyridine and 61 mg of 4-dimethylaminopyridine.

The product was rinsed with methylene dichloride, ethyl alcohol andether, and then dried. The products on the slide were reacted with 330mg of dicyclohexylcarbodiimide (DCC) for 30 minutes at room temperature.The solution was decanted and replaced with a solution of 117 mg of6-amino-1-hexanol in 2 ml of methylene dichloride and then left at roomtemperature for approximately 8 hours.

b. Oligonucleotide Synthesis on a Solid Support

The amine-functionalized solid support was prepared for oligonucleotidesynthesis by treatment with 400 mg of succinic anhydride and 244 mg of4-dimethylaminopyridine in 3 ml of anhydrous pyridine for 18 hours atroom temperature. The solid support was treated with 2 ml of DMFcontaining 3 millimoles (330 mg) of DCC and 3 millimoles (420 mg) ofp-nitrophenol at room temperature overnight. The slide was washed withDMF, CH₃CN, CH₂Cl₂ and ethyl ether. A solution of 2 millimoles (234 mg)of H₂N(CH₂)₆OH in 2 ml of DMF was reacted with the slide overnight. Theproduct of this reaction was a support,O(CH₂)₃NHCO(CH₂)₂CONH(CH₂)₅CH₂OH. The slide was washed with DMF, CH₃CN,methanol and ethyl ether.

The functionalized ester resulting from the preparation of the glasssupport was used for the synthesis of a oligonucleotide sequence. Eachnucleoside residue was added as a phosphoramidite according to knownprocedures (see, e.g., U.S. Pat. Nos. 4,725,677 and 5,198,540, andRE34,069, see, also Caruthers et al. U.S. Pat. No. 4,415,732).

5. Protein Analysis of the Captured Proteins and Complex Protein SampleComparison

The purified antibody batches can be either 1) directly attached to asolid surface, and incubated with protein samples, 2) incubated with thesamples and subsequently bound to a solid support without using thecapture compound or 3) the capture compound can be used to capture itscorresponding protein in a sample and subsequently sort the capturedproteins through specific nucleotide hybridization (FIG. 14).

IV. Antisense Oligonucleotide Capture Reagents are Immobilized inDiscrete and Known Locations on a Solid Surface to Create an AntibodyCapture Array

6. Preparation of Capture Array Surface

5′-aminated oligonucleotides are synthesized using phosphoramidatechemistry and attached to N-oxysuccinimide esters. The attachedoligonucleotide sequences are complementary to the sortingoligonucleotides of the bi-functional antibody molecules (FIG. 13).Proteins are captured through nucleic acid hybridization of theirsorting oligonucleotide to the complementary sequence attached to thesolid surface oligonucleotide.

V. The Antibody Capture Reagents are Added to the Total Protein Mixture(Reactivity Step). The Reaction Mixture is then Added to the SolidSurface Array Under Conditions that Allow Oligonucleotide Hybridization(Sorting Step).

7. Capture compound/protein capture and sorting

The bi-functional antibodies are incubated with the protein sample underconditions that allow the antibodies to bind to their correspondingantigen. The bi-functional antibody molecule with the captured proteinis added to the oligonucleotide prepared capture array. Under standardDNA annealing conditions that do not denature the antigen-antibodybinding, the bi-functional antibody will hybridize with its nucleic acidmoiety to the complementary oligonucleotide.

VI. The Captured Protein is Identified Using MALDI Mass Spectrometry

8. Analysis of the Capture Proteins

The attached proteins are analyzed using standard protein analysismethods, such as mass spectrometry.

EXAMPLE 4 Synthesis of Trityl Based Protein Capture Compounds (see FIG.15) A. Synthesis of 2-(4-bromophenyl)-4,4-dimethyl-1,3-oxazoline, 1

To 4-Bromobenzoic acid (50 g, 0.25M) placed in a 500 mL round bottomflask fitted with a reflux condenser was added 150 mL of thionylchloride and refluxed for 8 h. The excess thionyl chloride was removedunder vacuum and the white solid obtained was dissolved in 100 ml of dryCH₂Cl₂ and kept in an ice bath. To this ice cooled solution of bromobenzoylchloride was added drop wise 45 g of 2-amino-2-methylpropan-1-oldissolved in another 100 mL of dry CH₂Cl₂ with stirring for the periodof 1 h. The ice bath was removed and the reaction mixture was stirred atroom temperature for over night. The precipitated white solid wasfiltered and washed several times with CH₂Cl₂ (4×100 mL). The combinedCH₂Cl₂ was removed under rotaevoporator and the solid obtained wasslowly dissolved in 150 mL of thionyl chloride and refluxed for 3 h. Theexcess of SOCl₂ was evaporated to one-sixth the volume and poured in to500 mL of dry ether cooled in ice bath and kept in the refrigeratorovernight. The ether was removed and the precipitated hydrochloride wasdissolved in 500 mL of cold water. The aqueous solution was carefullyneutralized using 20% KOH solution on cold condition (ice bath) and thebrown oily residue separated was extracted with CH₂Cl₂ (3×200 mL) anddried over anhydrous Na₂SO₄. Removal of the solvent gave 42 g (67%) of2-(4-bromophenyl)-4,4-dimethyl-1,3-oxazoline as a yellow oil. ¹H-NMR(500 MHz, CDCl₃) δ ppm: 1.36 (s, 6H), 4.08 (s, 2H), 7.52 (d, 2H), 7.79(d, 2H). Mass: 254.3 (M⁺).

B. Synthesis ofphenyl-{3-[2-(tetrahydropyran-2-yloxy)-ethoxy]-phenyl}-methanone, 2

1. Method A: In a 100 mL two neck round bottom flask placed with 550 mg(8 mM) of NaOEt in 20 mL of dry DMF was added 3-hydroxy benzophenone (1g, 5 mM) under argon atmosphere. The reaction was stirred at roomtemperature for 10 min and added 2-bromoethoxy tetrahydropyran (1 g, 5mM) dissolved in 5 mL of dry DMF by drop wise. The reaction mixture washeated at 60° C. for overnight, cooled and poured into ice water andextracted with CH₂Cl₂ (2×50 mL). The combined solvent was dried overanhydrous Na₂SO₄ and evaporated. The crude residue obtained was purifiedby silica gel column chromatography using hexane/EtOAc (9:1) mixture asan eluent. Yield: 680 mg (42%).

2. Method B: To the stirred mixture of 3-hydroxy benzophenone (1 g, 5mM), anhydrous K₂CO₃ (3 g, 23 mM) and NaI (500 mg) in dry acetone (40mL) was added 2-bromoethoxytetrahydropyran (1 g, 5 mM) dissolved in 10mL of dry acetone and refluxed for 20 h. The precipitate was filteredand washed with acetone (3×20 mL). The combined filtrate was evaporatedand the yellowish residue obtained was purified by silica gel columnchromatography using hexane/EtOAc (9:1) mixture as an eluent. Yield:55-60%. ¹H-NMR (500 MHz, CDCl₃) 8 ppm: 1.5-1.63 (m, 4H), 1.72 (m, 1H),1.82 (m, 1H), 3.52 (m, 1H), 3.8-3.9 (m, 2H), 4.07 (m, 1H), 4.21 (m, 2H),4.70 (t, 1H), 7.15 (d, 1H), 7.37 (m, 3H), (7.47 (t, 2H), 7.58 (t, 1H),7.80 (d, 1H). Mass: 327.2 (M⁺), 349.3 (M+Na⁺).

C. Grignard reaction: Synthesis of2-{4′-(3-(2-tetrahydropyran-2-yloxy)ethoxy)phenyl-4″-phenyl)}-4,4-dimethyl-1,3-oxazoline,3

To a 100 mL two necked round-bottomed flask fitted with reflux condenserwas placed activated Mg turnings (720 mg, 30 mM), a few crystals of I₂and molecular sieves (A4) under argon. To this mixture 10 ml of THF wasadded. The mixture was heated to 50° C. and2-(4-bromophenyl)-4,4-dimethyl-1,3-oxazoline (6.5 g, 26 mM) dissolved in15 mL of dry THF, a catalytic amount of CH₃I, RED-Al and CCl₄ were addedwith stirring and refluxed for 3 h. After that the reaction mixture wascooled to room temperature and addedphenyl-{3-[2-(tetrahydropyran-2-yloxy)-ethoxy]-phenyl}-methanone (5.1 g,15.6 mM) dissolved in 15 mL of dry THF and again refluxed for 3 h,cooled and 3 mL of water added. The solvent was removed underrotaevaporator and extracted with CHCl₃ (3×100 mL) and dried overanhydrous Na₂SO₄. The residue obtained on removal of the solvent wasseparated by silica gel column chromatography using hexane/EtOAc (7:3)as an eluent. Evaporation of the column fraction yielded2-{4′-(3-(2-tetrahydropyran-2-yloxy)ethoxy)phenyl-4″-phenyl)}-4,4-dimethyl-1,3-oxazoline(3) as a yellow crystalline solid (1.4 g, 18%). ¹H-NMR (500 MHz, CDCl₃)δ ppm: 1.37 (s, 6H), 1.5-1.63 (m, 4H), 1.68 (m, 1H), 1.80 (m, 1H), 2.85(s, 1H, —OH), 3.49 (m, 1H), 3.75 (m, 1H), 3.85 (m, 1H), 3.97 (m, 1H),4.09 (m, 4H), 4.66 (t, 1H), 6.80 (d, 1H), 6.84 (d, 1H), 6.88 (s, 1H),7.18-7.31 (m, 6H), 7.34 (d, 2H), 7.87 (d, 2H). Mass: 502.6 (M+1), 524.5(M+Na⁺)

D.4,4-dimethyl-2-[4-(phenyl-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-{3-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-phenyl}-methyl)-phenyl]-4,5-dihydrooxazole,4

To the stirred mixture of2-{4′-(3-(2-tetrahydropyran-2-yloxy)ethoxy)phenyl-4″-phenyl)}-4,4-dimethyl-1,3-oxazoline(3, 200 mg, 0.4 mM) and NaH (100 mg, 4 mM) in 3 mL of dry DMF at r.t.was added 2-(2-bromoethoxy)tetrahydro-2H-pyran (500 mg, 2.4 mM) and thereaction was allowed to stir at r.t. for 2 h. Then the reaction mixturewas poured in to ice water and extracted with CH₂Cl₂ (3×20 mL) and driedover anhydrous Na₂SO₄. Evaporation of the solvent gave 4 as a yellowoily residue in quantitative yield.

E.4-{(2-hydroxy-ethoxy)-[3-(2-hydroxy-ethoxy)-phenyl]-phenyl-methyl}-benzoicacid, 5

A solution of 4 (360 mg) in 3 mL of 80% aqueous acetic acid was heatedat 75° C. for 12 h. Then the solution was evaporated and the residueobtained was refluxed with 20% NaOH/EtOH (1:1, v/v, 3 mL) for 2 h. Thesolvent was removed and 10 mL of ice cooled water was added to theresidue and the aqueous solution was acidified with 1N HCl. Theprecipitated yellow solid was filtered and washed several times withwater and dried under high vacuum. Yield: 270 mg (100%, quantitative).

F.4-{(2-hydroxy-ethoxy)-[3-(2-hydroxy-ethoxy)-phenyl]-phenyl-methyl}-benzoicacid 2,5-dioxo-pyrrolidin-1-yl ester, 6

1. Method A: To a stirred solution of trityl acid 5 (110 mg, 0.26 mM)and N-hydroxy succinimide (80 mg, 0.7 mM) in dry 1,4-dioxane (2 mL) wasadded 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC,105 mg, 0.5 mM) dissolved in 2 mL of water. The reaction mixture wasstirred for 12 h at r.t. and extracted with CHCl₃ (3×10 mL) and driedover anhydrous Na₂SO₄. The solid obtained on evaporation of the solventwas purified by preparative TLC plate. Yield: 5 mg.

2. Method B: To a stirred solution of trityl acid 5 (12 mg, 0.03 mM) indry THF (4 mL) was added dicyclohexyl carbodiimide (DDC, 10 mg, 0.05mM). The reaction mixture was stirred for 30 min at r.t., andN-hydroxysuccinimide (11.5 mg, 0.1 mM) and a catalytic amount of DMAPwas added and allowed to stir for overnight. The solvent was removedunder rotaevaporator and the solid obtained was dissolved in dry ether.The precipitated DCU was filtered and the solvent ether was evaporated.The crude solid obtained was purified by preparative TLC plate. Yield: 7mg (50%). ¹H-NMR (500 MHz, CDCl₃) δ ppm: 2.90 (s, 4H), 3.92 (t, 4H),4.02 (t, 4H), 6.83 (m, 2H), 7.25 (m, 3H), 7.34 (m, 4H), 7.50 (d, 2H),8.0 (d, 2H).

G.4,4-dimethyl-2-[4-(phenyl-(3-phenyl-propoxy)-{3-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-phenyl}-methyl)-phenyl]-4,5-dihydro-oxazole,7

To the stirred mixture of2-{4′-(3-(2-tetrahydropyran-2-yloxy)ethoxy)phenyl-4″-phenyl)}-4,4-dimethyl-1,3-oxazoline(3, 300 mg, 0.6 mM) and NaH (100 mg, 4 mM) in 3 mL of dry DMF at r.t.was added 3-bromo-1-phenyl propane (250 mg, 1.2 mM) and the reaction wasallowed to stir at r.t. for 2 h. Then the reaction mixture was pouredinto ice water and extracted with CH₂Cl₂ (3×20 mL) and dried overanhydrous Na₂SO₄. Evaporation of the solvent gave 7 as a yellow colorresidue in quantitative yield.

H.4-[[3-(2-hydroxy-ethoxy)-phenyl]-phenyl-(3-phenyl-propoxy)-methyl]-benzoicacid, 8

A solution of 7 (550 mg) in 3 mL of 80% aqueous acetic acid was heatedat 75° C. for overnight. Then the solution was evaporated and theresidue obtained was refluxed with 20% NaOH/EtOH (1:1, v/v, 3 mL) for 2h. The solvent was removed, 10 mL of ice cooled water added to theresidue and the aqueous solution acidified with 1N HCl, extracted withCH₂Cl₂ (60 mL) and dried over anhydrous Na₂SO₄. Evaporation of thesolvent gave yellow solid Yield: 485 mg (quantitative).

I.4-[[3-(2-hydroxy-ethoxy)-phenyl]-phenyl-(3-phenyl-propoxy)-methyl]-benzoicacid 2,5-dioxo-pyrrolidin-1-yl ester, 9

To a stirred solution of trityl acid 8 (200 mg, 0.42 mM) in dry THF (6mL) was added dicyclohexyl carbodiimide (DDC, 206 mg, 1 mM). Thereaction mixture was stirred for 30 min at r.t., N-hydroxysuccinimide(70 mg, 0.6 mM) and a catalytic amount of DMAP were added and wasallowed to stir for overnight. The solvent was removed underrotaevaporator and the solid obtained was dissolved in dry ether. Theprecipitated DCU was filtered and the solvent ether was evaporated. Thecrude solid obtained was separated by silica column chromatography usingCH₂Cl₂. Yield: about 120 mg. ¹H-NMR (500 MHz, CDCl₃) δ ppm: 1.70 (m,2H), 1.9 (t, 2H), 2.9 (s, 4H), 3.5 (m, 2H), 3.9 (t, 2H), 4.0 (t, 2H),6.85 (m, 4H), 7.25 (m, 4H), 7.32 (m, 5H), 7.51 (m, 3H), 8.09 (d, 2H).

J.1-{4-[[3-(2-hydroxy-ethoxy)-phenyl]-phenyl-(3-phenyl-propoxy)-methyl]-benzoyl}-pyrrole-2,5-dione,10

To a stirred solution of trityl acid 8 (280 mg, 0.42 mM) in dry THF (6mL) was added dicyclohexyl carbodiimide (DDC, 400 mg, 1.95 mM). Thereaction mixture was stirred for 30 min at r.t., maleimide (100 mg, 1.1mM) and a catalytic amount of DMAP were added and allowed to stir forovernight. The solvent was removed under rotaevaporator and the solidobtained was dissolved in dry ether. The precipitated DCU was filteredand the solvent ether was evaporated. Part of the product was purifiedby preparative TLC. Yield: 12 mg. ¹H-NMR (500 MHz, CDCl₃) δ ppm: 1.78(m, 2H), 1.95 (m 2H), 2.9 (s, 4H), 3.51 (m, 2H), 3.93 (t, 2H), 4.02 (t,2H), 6.8 (m, 5H), 7.25 (m, 5H), 7.29 (m, 5H), 7.37 (m, 3H), 7.48 (d,2H), Mass: 561.3 (M⁺).

EXAMPLE 5

This Example shows addition of a selectivity function onto a capturecompound possessing a N-hydroxy succinimidyl ester reactivity function.Compounds with a sorting function can be prepared by using anappropriate analog of compound 11 below.

Procedure for Mitsunobu Reaction of Trityl Capture Reagents

1.1 equivalents of triphenylphosphine are added to a reaction vial anddissolved in 1.0 ml THF. 1.1 equivalents of diisopropylazidodicarboxylate are added to this solution and mixed for 5 minutes.Add 1 equivalent of 11 and stir for 5 minutes. Add nucleophile (R₁—OH)and stir overnight at 50° C. Preparative TLC purified the products.

EXAMPLE 6 Cell Synchronization

H460 lung cancer and SW480 colon cancer cells were synchronized in Go/G1with simvastatin and lovastatin (HMG-CoA reductase inhibitors), whichcan enrich a cancer cell population in Go/G1. Cells arrested in G2/Mphase were obtained by treatment with nocodazole.

Cell Culture and Reagents

The SW480 cell line was cultured in Dulbecco's modified Eagle medium(DMEM), the H460 cell line (ATCC Manassas, Va.) was cultured in RPMI1640, whereas the FK101 was cultured in serum-free medium (SFM) with 5%CO₂ at 37° C. The cell culture media were supplemented with 10% fetalbovine serum (FBS), 2 mM L-glutamine, penicillin(100 U/ml) andstreptomycin(100 U/ml).

Synchronization of Cells

H460 and SW480 cells enriched in G₁ phase were obtained after incubationwith serum-free medium for 48 hours, or treatment with U026, lovastatinor simvastatin. Cells in S phase were synchronized by incubating cellswith medium containing no serum for 24 hours, followed by aphidicolintreatment (2 μg/ml) for 20 hours and release of cells from aphidicolinfor 3 hours. Cells arrested in G2/M phase were obtained by treatmentwith nocodazole (0.4-0.8 mg/ml) for 16-20 hours.

EXAMPLE 7 Synthesis of (4,4′-bisphenyl-hydroxymethyl)benzoyl maleimidederivatives

R═

General Procedure: A solution of 4-(diphenylhydroxymethyl)benzoic acid(0.04 mM) in 1 mL of SOCl₂ was refluxed for 1 h and the excess SOCl₂ wasremoved under high vacuum. To this yellow solid residue obtained wasadded maleimide (0.045 mM) dissolved in dry freshly distilled THF (1 mL)and stirred at room temperature for 2 h. The solvent was removed andadded the corresponding alcohol (ROH, 2-5 fold excess) dissolved in drypyridine (1 mL) with stirring. After the reaction mixture stirred atroom temperature for overnight the solution was extracted with CH₂Cl₂(5×3 mL) and dried over anhydrous Na₂SO₄. The residue obtained onevaporation of the solvent was separated by preparative TLC (Silica Gel,500 μm plate) and gave the product 1 in 50-60% yield. The tritylderivatives 1 were fully characterized by ¹H NMR and mass spectral data.

EXAMPLE 8 Succinimidyl Ester Trityl Capture Compound Synthesis

Procedure 1

4-(Diphenylhydroxymethyl)benzoic acid was reacted with 2 equivalents ofN-hydroxysuccinimide using 1.2 equivalents of Diisopropyl carbodiimide.The desired product was purified by Flash Silica chromatography andcharacterized by ESI mass spectrometry.

The 125 μmoles of product from above was added to 1.0 ml AcetylChloride. This reaction mixture was stirred at room temperature for 1hour and evaporated three times with toluene to remove excess acetylchloride. Equal volumes of the reaction mixture were added tonucleophiles (see below) dissolved in 1.0 M Pyridine/THF. These reactionmixtures were mixed at 60° C. for 2 hours. The resulting products wereextracted from CHCl₃ and 10% HOAc. Products were purified by PreparativeTLC (Ether). MS and NMR characterize purified products.

ROH═

Procedure 2

1.64 mmoles of 4-(Diphenylhydroxymethyl)benzoic acid was dissolved into5 ml Thionyl Chloride. This reaction mixture is heated to 79° C. andstirred for 75 minutes. The Thionyl Chloride is removed under N₂ (g)stream. 1.3 equivalents of N-hydroxysuccinimide dissolved in dry THF isadded to this dried reaction mixture and stirred for 1 hour. The THFsolvent is removed under N₂ (g) stream. The product is dissolved intodry Pyridine. Equal volumes of this solution are added to nucleophilesdissolved in Pyridine. (See below). The resulting products are extractedfrom CHCl₃ and 10% HOAc. Products are purified by Preparative TLC(Ether). MS and NMR characterize purified products.

ROH═

EXAMPLE 9

This example shows exemplary capture binding assays and the effects ofselectivity functions on binding. This example shows that changingselectivity can alter reactivity of the capture compound therebyproviding a means to probe biomolecule structures and to permit sortingor diversity reduction using the collections. In this example, the coregroup of the capture compounds is a trityl group and the reactive groupis succinimide, which interacts with a primary amine. Compound HKC 1341(2,5-dioxopyrrolidin-1-yl acetate) is a non-selective compound that hasa reactivity group, but no selectivity group. Compound HKC 1343(2,5-dioxopyrrolidin-1-yl 4-(hydroxybis(4-methoxyphenyl)methyl)benzoate,see FIG. 20) is exemplary of such a compound where the selectivity groupis —OH. As the selectivity group changes there is a difference inreactivity on the target proteins (lysozyme, cytochrome C andubiquitin).

Lysozyme

Three different capture compounds (designated HKC 1343(2,5-dioxopyrrolidin-1-yl4-(hydroxybis(4-methoxyphenyl)methyl)benzoate), HKC 1349(1-(4-((3-(2-hydroxyethoxy)phenyl)(phenyl)(3-phenylpropoxy)methyl)benzoyl)-1H-pyrrole-2,5-dione),and HKC 1365(3-((4-((2,5-dioxopyrrolidin-1-yloxy)carbonyl)phenyl)diphenylmethoxy)propane-1,2-diyldipalmitate)) were reacted individually with Lysozyme (Accession numberP00698; FIG. 20 b). The capture experiments were analyzed usingMALDI-TOF Mass Spectrometry. Binding was performed in 20 μL samplevolumes with a 5 μM Lysozyme concentrations in 25 mM HEPES buffersolution, pH 7.0. The trityl-based capture compounds were added to theprotein solution at a 10 μM concentration. The binding reaction wasincubated at room temperature for 30 minutes. The reaction was quenchedusing 1 μL of a 100 mM TRIZMA base solution.

The capture compound-protein binding mixture was prepared for massspectrometry by mixing a 1 μL aliquot of a binding reaction with 1 μL ofa 10 mg/mL sinapinic acid in 30% aqueous acetonitrile. The sample wasdeposited as a 500 mL spot on the surface of the mass target plates andair-dried before mass spectrometric analysis. The results of the massspectrometry analysis, which are shown in FIG. 20 b, demonstrate thataddition of selectivity groups to compounds permits alterations in thebinding specificity of capture compounds.

Cytochrome C

Four different capture compounds (designated HKC 1341(2,5-dioxopyrrolidin-1-yl acetate), HKC 1343 (2,5-dioxopyrrolidin-1-yl4-(hydroxybis(4-methoxyphenyl)methyl)benzoate), HKC 1349(1-(4-((3-(2-hydroxyethoxy)phenyl)(phenyl)(3-phenylpropoxy)methyl)benzoyl)-1H-pyrrole-2,5-dione),and HKC 1365(3-((4-((2,5-dioxopyrrolidin-1-yloxy)carbonyl)phenyl)diphenylmethoxy)propane-1,2-diyldipalmitate)) were reacted individually with Cytochrome C (accessionnumber: P00006, FIG. 20 c). The capture experiments were analyzed usingMALDI-TOF Mass Spectrometry. Binding was performed in 20 μL samplevolumes with 5 μM Cytochrome C concentrations in 25 mM HEPES buffersolution, pH 7.0. The trityl-based capture compounds were added to theprotein solution at a 10 μM concentration. The binding reaction wasincubated at room temperature for 30 minutes. The reaction was quenchedusing 1 μL of a 100 mM TRIZMA base solution. The capturecompound-protein binding mixture was prepared for mass spectrometryanalysis by mixing a 1 μL aliquot of the binding reaction with 1 μL of a10 mg/mL sinapinic acid in 30% aqueous acetonitrile. The sample wasdeposited as a 500 mL spot on the surface of mass target plates andsubsequently air-dried before mass spectrometric analyses. The resultsof the mass spectrometry analysis, which are shown in FIG. 20 c,demonstrate that addition of selectivity groups to compounds permitsalterations in the binding specificity of capture compounds.

HKC 1343 (2,5-dioxopyrrolidin-1-yl4-(hydroxybis(4-methoxyphenyl)methyl)benzoate)

One of the exemplary capture compounds (HKC 1343) was incubated with amixture of three different proteins (Ubiquitin, (P02248), CytochromeC(P00006) and Lysozyme (P00698)) (see, FIG. 20 d). The captureexperiment was analyzed using MALDI-TOF Mass Spectrometry. The bindingreactions were performed in a 20 sample volume with all three proteinsat 5 μM concentrations in 25 mM HEPES buffer solution pH 7.0. Thetrityl-based capture compound was added to the protein solution at a 25μM concentration. The binding reaction was incubated at room temperaturefor 30 minutes and the reaction quenched using 1 μL of a 100 mM TRIZMAbase solution. The capture compound-protein binding mixture was preparedfor mass spectrometry by mixing a 1 μL aliquot of the binding reactionwith 1 μL of 10 mg/mL sinapinic acid in 30% aqueous acetonitrile. Thesample was deposited as a 500 mL spot on the surface of mass targetplates and air-dried before mass spectral analysis. The results of themass spectrometry analysis, which are shown in FIG. 20 d, demonstratethat a plurality of compounds bound to a single capture agent that isselective can be identified by mass spectrometric analysis.

HKC 1365(3-((4-((2,5-dioxopyrrolidin-1-yloxy)carbonyl)phenyl)-diphenylmethoxy)propane-1,2-diyldipalmitate)

Another of the exemplary capture compounds (HKC 1365) was incubated witha mixture of three different proteins (Ubiquitin (P02248), CytochromeC(P00006) and Lysozyme (P00698); see FIG. 20 e). The capture experimentwas analyzed using MALDI-TOF Mass Spectrometry. The binding reactionswere performed in a 20 μL sample volume with all three proteins at 5 μMconcentrations in 25 mM HEPES buffer solution pH 7.0. The trityl-basedcapture compound was added to the protein solution at a 15 μMconcentration. The binding reaction was incubated at room temperaturefor 30 minutes, and quenched using 1 μL of a 100 mM TRIZMA basesolution. The capture compound-protein binding mixture was prepared formass spectrometry by mixing a 1 μL aliquot of the binding reaction with1 μL of 10 mg/mL sinapinic acid in 30% aqueous acetonitrile. The samplewas deposited as a 500 mL spot on the surface of the mass target platesand air-dried before mass spectral analyses. The results of the massspectrometry analysis, which are shown in FIG. 20 e, demonstrate that aplurality of compounds bound to a single capture agent that is selectivecan be identified by mass spectrometric analysis.

Reaction of Cytochrome C with a Non-Specific Compound

FIG. 20 f shows mass spectra for a time course reaction of cytochrome Cwith a non-specific compound (HKC 1341). The succinamide reactive groupshows specificity and reactivity with the lysines of cytochrome c. Thetop spectrum shows no modification at time 0, the middle spectrum shows1-9 modifications resulting from binding of HKC 1341 after 30 minutes,and the bottom spectrum shows, after 24 hours, 17 and 18 modifications,which correspond to the number of lysines (18) in cytochrome c.

EXAMPLE 10

This example shows the selectivity of the capture compound reacting amixture of capture compounds and a mixture of proteins

Materials:

Reaction buffer: 25 mM HEPES, pH 7.0

Proteins: mixture of ubiquitin, cytochrome c and lysozyme (molar ratiois 1/5/6), the protein stock is made as 5 mg/ml (total proteins) inreaction buffer.

Capture compounds: HKC 1343 (2,5-dioxopyrrolidin-1-yl4-(hydroxybis(4-methoxyphenyl)methyl)benzoate) and HKC 1365(3-((4-((2,5-dioxopyrrolidin-1-yloxy)carbonyl)phenyl)diphenylmethoxy)propane-1,2-diyldipalmitate), stock solution is 1 mM in acetonitrile.

Capturing Reaction

A protein dilution (mixture) is prepared in the reaction buffer at theconcentration of 0.5, 2.5 and 3 μM, for ubiquitin, cytochrome c andlysozyme, respectively. 19.5 μl is used for one capturing reaction. Eachreaction is started by adding 0.5 μl of 1 mM compound stock solution(final 25 μM). The reaction mixture is incubated at room temperature for30 min before the reaction is stopped by the addition of 5 mM TRIZMA.

Three different reactions are run. The first two tubes contain HKC 1343and HKC 1365 individually, and a third one is started by addingcompounds HKC 1343 and 1365 (final concentration 25 μM for eachcompound). After the reaction, 1 μl of each sample is mixed with equalvolume of matrix and subjected to MALDI analysis. Statistic significanceof the results is ensured by triplicate each reaction sample.

Since modifications will be apparent to those of skill in this art, itis intended that this invention be limited only by the scope of theappended claims.

What is claimed is:
 1. A capture compound of formula:

wherein: X is a reactivity function that covalently binds to amino acidside chains of proteins; Y, the selectivity function, interactsnon-covalently with proteins and modulates one or more of the affinity,steric properties and electronic properties of the capture compoundthereby increasing selectivity of the binding by X to the amino acidside chains of the proteins, whereby X covalently binds to fewer sidechains of the proteins when Y is present than in its absence; Q permitsseparation or immobilization of the capture compound and is selectedfrom among biotin, 6-His, an oligonucleotide, BODIPY, an adhesivepeptide, and peptide nucleic acid (PNA); Z is a trityl derivative forpresenting functional moieties X, Y and Q; and Z has the formula:

any two of moieties Q, X and Y are attached to the phenyl rings, and theremaining moiety is attached to the central carbon atom; wherein one ormore of X, Y or Q is optionally attached to a spacer moiety.
 2. Acollection of capture compounds, containing at least two Differentcompounds of claim 1, wherein each and every capture compound in thecollection has the formula:


3. The collection of claim 2, containing at least three differentcompounds of claim 1, wherein each and every capture compound in thecollection has the formula:


4. The collection of claim 3, containing at least five differentCompounds of claim 1, wherein each and every capture compound in thecollection has the formula:


5. The collection of claim 2, wherein each compound in the Collectioncomprises the same X, Z and Q moieties but differs in the Y moiety. 6.The compound of claim 1, wherein Q permits separation by arraying of thecapture compounds on a solid support by binding to the surface or amolecule thereon.
 7. The compound of claim 1, wherein X is—C(═O)O-Ph-pNO₂, —C(═O)O—C₆F₅, C(═O)—O—(N-succinimidyl), —OCH₂—I,—OCH₂—Br, OCH₂—Cl, —C(O)CH₂I, —C(O)CH₂Br or —C(O)CH₂Cl.
 8. A compound ofclaim 1, wherein Y═


9. A collection of claim 4, wherein Y═


10. The compound of claim 1, wherein Q permits immobilization of thecapture compound at an addressable locus on a solid support.
 11. A solidsupport, comprising a compound of claim
 1. 12. A compound of claim 1,wherein: X is selected from among an active ester, an active halomoiety, an amino acid side chain-specific functional group and a metalcomplex; Y is a monovalent group selected from among straight orbranched chain alkyl, straight or branched chain alkenyl, straight orbranched chain alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl,heterocyclyl, straight or branched chain heterocyclylalkyl, straight orbranched chain heterocyclylalkenyl, straight or branched chainheterocyclylalkynyl, aryl, straight or branched chain aralkyl, straightor branched chain aralkenyl, straight or branched chain aralkenyl,heteroaryl, straight or branched chain heteroarylalkyl, straight orbranched chain heteroarylalkenyl, straight or branched chainheteroarylalkynyl, halo, straight or branched chain haloalkyl,pseudohalo, azido, cyano, nitro, OR⁶⁰, NR⁶⁰R⁶¹, COOR⁶⁰, C(0)R⁶⁰,C(0)NR⁶⁰R⁶⁰, S(0)_(q)R⁶⁰, S(0)_(q)OR⁶⁰, S(0)_(q)NR⁶⁰R⁶¹, NR⁶⁰C(O)R⁶¹,NR⁶⁰C(0)NR⁶⁰R⁶¹, NR⁶⁰S(0)_(q)R⁶⁰, SiR⁶⁰R⁶¹R⁶², P(R⁶⁰)₂, P(O)(R⁶⁰)₂,P(OR⁶⁰)₂, P(O)(OR⁶⁰)₂, P(O)(OR⁶⁰)(R⁶¹) and P(O)NR⁶⁰R⁶¹, where q is aninteger from 0 to 2; and each R⁶⁰, R⁶¹, and R⁶² is independentlyhydrogen, straight or branched chain alkyl, straight or branched chainalkenyl, straight or branched chain alkynyl, aryl, straight or branchedchain aralkyl, straight or branched chain aralkenyl, straight orbranched chain aralkynyl, heteroaryl, straight or branched chainheteroaralkyl, straight or branched chain heteroaralkenyl, straight orbranched chain heteroaralkynyl, heterocyclyl, straight or branched chainheterocyclylalkyl, straight or branched chain heterocyclylalkenyl orstraight or branched chain heterocyclylalkynyl.
 13. A compound of claim12, wherein X is —C(═O)O-Ph-pNO₂, —C(═O)O—C₆F₅,—C(═O)—O—(N-succinimidyl), —OCH₂—I, —OCH₂—Br, —OCH₂—Cl, —C(O)CH₂I,—C(O)CH₂Br or —C(O)CH₂Cl.
 14. The compound of claim 1, wherein X isselected from among an active ester, an active halo moiety, an aminoacid side chain-specific functional group and a metal complex.
 15. Thecompound of claim 14, wherein X is an α-halo ether, an α-halo carbonylgroup, maleimido, a gold complex, a mercury complex, an epoxide or anisothiocyanate.
 16. The compound of claim 1, further comprising a massmodifying tag.
 17. The compound of claim 16, wherein the mass modifyingtag is selected from (i)-(vii) as follows: (i) the mass modifying taghas the formula —X¹R¹⁰—, wherein: X¹ is a divalent group selected from—O—, —O—C(O)—(CH₂)_(y)—C(O)O—, —NH—C(O)—, —C(O)—NH—,—NH—C(O)—(CH2)_(y)—C(O)O—, —NH—C(S)—NH—, —O—P(0-alkyl)—O—, 0—SO₂—O—,—O—C(O)—CH₂—S—, —S—, —NH— and

and R¹⁰ is a divalent group selected from —(CH₂CH₂O)_(z)—CH₂CH₂O—,—(CH₂CH₂O)_(z)—CH₂CH₂O-alkylene, alkylene, alkenylene, alkynylene,arylene, heteroarylene, —(CH₂)_(z)—CH₂—O—, —(CH₂)_(z)—CH₂—O-alkylene,—(CH₂CH₂NH)_(z)—CH₂XH₂NH—, —CH₂—CH(OH)—CH₂O—, —Si(R¹²)(R¹³)—, —CHF— and—CF₂—; where y is an integer from 1 to 20; z is an integer from 0 to200; and wherein R¹² and R¹³ are each independently selected from alkyl,aryl and aralkyl; or (ii) the mass modifying tag is —S—S—; (iii) themass modifying tag is —S—; (iv) the mass modifying tag is—(NH—(CH₂)_(y)—NH—C(O)—(CH₂)_(y)—C(O))_(z)—NH—(CH₂)_(y)—NH—C(O)—(CH₂)_(y)—C(O)O—,where y and z are selected as in (i); (v) the mass modifying tag is—(NH—(CH₂)_(y)—C(0))—NH—(Cliz)_(y)—C(O)O—, where y and z are selected asin (i); (vi) the mass modifying tag is—(NH—CH(R¹¹)—C(0))NH—CH(R¹¹)—C(O)0O—, where R¹¹ is the side chain of anaturally occurring α-amino acid and z is selected as in (i); or (vii)the mass modifying tag is —(O—(CH₂)_(y)—C(O))_(z)—NH—(CH₂)_(y)—C(O)O—,where y and z are selected as in (i).
 18. A compound of claim 1covalently bound to a protein via X.
 19. The collection of claim 2,wherein each capture compound in the collection comprises the same Xmoiety but differs in the Y moiety.
 20. The collection of claim 2,wherein each capture compound in the collection differs from any othercapture compound in the collection by having a different Y moiety thenany other capture compound in the collection, and a different Q moietythen any other capture compound in the collection.
 21. The collection ofclaim 2, wherein each capture compound in the collection differs fromany other capture compound in the collection by having a different Xmoiety then any other capture compound in the collection, and adifferent Y moiety then any other capture compound in the collection.22. A compound of claim 1, wherein Q is an oligonucleotide or comprisesbiotin.
 23. The compound of claim 1, wherein the spacer moiety is—(CH₂)_(r)—, —(CH₂O)—, —(CH₂CH₂—O)_(r)—, —(NH—(CH)_(r)—C(O))_(s)—,—(NH—CH(R52)—C(═O))_(s)—, or —(O—(CH)_(r)—C(═O))_(s)—, where r and s areeach independently an integer from 1 to 10 and R⁵² is the side chain ofa natural α-amino acid.
 24. A compound of claim 1, wherein theselectivity function Y is selected from those set forth in FIGS. 17 a-17hhhh and/or the reactivity function X is selected from those set forthin FIGS. 16 a-b.